WO2010100054A1 - Device for detecting the occupied state and the free state of a track section as well as method for operating such a device - Google Patents

Device for detecting the occupied state and the free state of a track section as well as method for operating such a device Download PDF

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Publication number
WO2010100054A1
WO2010100054A1 PCT/EP2010/052247 EP2010052247W WO2010100054A1 WO 2010100054 A1 WO2010100054 A1 WO 2010100054A1 EP 2010052247 W EP2010052247 W EP 2010052247W WO 2010100054 A1 WO2010100054 A1 WO 2010100054A1
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WO
WIPO (PCT)
Prior art keywords
modulation
signal
track
sigs
sige
Prior art date
Application number
PCT/EP2010/052247
Other languages
German (de)
French (fr)
Inventor
Peer Bohlmann
Gerald Lude
Bernd Raschke
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE102009010907.2 priority Critical
Priority to DE200910010907 priority patent/DE102009010907A1/en
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2010100054A1 publication Critical patent/WO2010100054A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61LGUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
    • B61L1/18Railway track circuits
    • B61L1/181Details
    • B61L1/188Use of coded current

Abstract

The invention relates to a device (V) for detecting the occupied state or free state of a track section (G) which is particularly simple and at the same time particularly resistant to interference influences, said device (V) having a transmitter (S) for feeding a transmission signal (SIGS), encoded by means of modulation, into the running rails (F) of the track section (G) and at least one receiver (E) for receiving a reception signal (SIGE) which is brought about through transmission of the transmission signal (SIGS) via the running rails (F) of the track section (G), wherein the device (V) according to the invention is designed to compare the modulation of the reception signal (SIGE) with the modulation of the transmission signal (SIGS). The invention also relates to a method for operating a device (V) for detecting the occupied state and free state of a track section (G).

Description


  description

  
Device for detecting the occupied and free state of a track section and method for operating such a device

  
The present invention relates to a device for detecting the occupancy or free state of a track section with a transmitter for feeding a modulation encoded transmission signal in the tracks of the track section and at least one receiver for receiving a by transmitting the transmission signal on the rails of the track section caused receive signal.

  
Such a device is in the form of a trained as a track circuit track free signaling device, for example, from the company publication of Siemens AG "FTG S - track vacancy with the audio frequency track circuit FTG S", order no. A19100-V100-B607-V2 known. In this case, a transmitter feeds an AC voltage into the rails of a track section to be monitored. A receiver receives a receive signal in the form of the incoming voltage and evaluates the receive signal. Due to the fact that a rail vehicle traveling through the track section causes a short circuit between the rails of the track section through its axes, the transmission of the transmission signal to the receiver is prevented. This thus makes it possible to detect the busy condition of the track section in question.

  
In order to increase the reliability against interference and to make the track circuit, in particular insensitive to electrical influences by harmonics in the train return current, carried out in the known device encoding the transmission signal by means of a modulation. In this case, one of a total of 15 fixed, predetermined bit patterns of different lengths per track-track frequency is continuously modulated onto the transmission signal as a coding. On the receiver side, the coding in the form of the modulation is read from the reception signal and compared with the coding permanently prescribed for the respective track circuit. This ensures a unique and correct assignment such that a receive signal received by the receiver actually originates from the transmitter of the same DC circuit.

   This rules out that, for example due to electrical influences, for example by touching the wires of two cables routed in one cable, a receive signal from another track circuit is erroneously received and used for the detection of the busy or free state of the track section.

  
The known device has the disadvantage that only 15 bit patterns are available for coding. Even in the case of an audio-frequency track circuit with transmission signals of different frequencies, it can often not be ruled out or avoided here that transmission signals having the same frequency as well as the same bit pattern are used several times within a project or a plant, as a result of which increased interference can occur.

  
The present invention has for its object to provide a particularly simple and at the same time against interference particularly insensitive device of the type mentioned.

  
This object is achieved according to the invention by a device for detecting the busy or free state of a track section with a transmitter for feeding a coded by a modulation transmission signal in the rails of the track section and at least one receiver for receiving a by a transmission of the transmission signal on the rails of the track section caused reception signal, wherein the device for comparing the modulation of the reception signal with the modulation of the transmission signal is formed.

  
The invention is thus characterized by the fact that a complete detachment from the known concept that a receiver receives a signal encoded by a modulation receive signal and the modulation of the received signal based on a comparison with a fixed for the device in question, the receiver side checked known modulation. Instead, a corresponding check is carried out according to the invention in that the device for comparing the modulation of the receive signal with the modulation of the transmit signal is formed. By comparing the modulations of the receive signal and the transmit signal thus the identity of the two signals is verified in a particularly simple manner.

   This eliminates advantageously the need to use rigid, fixed predetermined codes, such as in the form of bit patterns, and allocate corresponding codes of the respective device fixed. This advantageously also eliminates corresponding expenses for the configuration of the individual devices, which reduces the manufacturing cost of the device. Furthermore, the assembly is simplified, resulting in addition a time and thus cost savings. In addition, the project planning of a railway safety monitoring system is simplified, since no assignments of codes or modulations to devices are to be provided and therefore also corresponding assignments are not to be stored on site plans and data sheets and must be considered below.

   Furthermore, any restrictions with regard to the number and type of modulation used for coding are advantageously eliminated, so that the prerequisite is created that a multiple use of the same modulations within a plant can be ruled out.

  
It should be noted that the transmission signal within the scope of the device according to the invention is preferably an audio-frequency signal. In addition, however, there is also the possibility that a transmission signal with a frequency below or above the audio frequency range or in the form of a DC signal is used.

  
Preferably, the device is designed such that, if a comparison of the modulation of the received signal with the modulation of the transmitted signal, a deviation of the modulations is detected, the track section associated with the device for the purpose of risk prevention is promptly reported as busy.

  
According to a particularly preferred embodiment, the device according to the invention is designed to generate a transmission signal which is coded by means of an arbitrarily generated, in particular random-based, modulation. This is advantageous since the use of any modulation, in particular random-based, modulation as coding means that interference between two devices of a monitoring device can practically be ruled out due to the use of the same modulation.

   In this case, the modulation used is arbitrary to the effect that no fixed assignment of the coding used to the respective device or the respective transmitter exists and is ensured by the manner of generating the coding that can be ruled out with almost certain probability that within a plant two Devices use the same modulation. Corresponding algorithms with which, for example using random numbers or pseudo-Zufauszahlen a random-based coding of the respective transmission signal can be made are known as such from mathematics or computer science, so that will not be discussed in more detail below.

   It should be noted that the use of any, in particular randomized or randomly generated, modulation is made possible only by the fact that the inventive device allows a comparison of the modulation and thus a check of the identity of the transmit signal and the receive signal, without that for this purpose the receiver needs to be aware in advance of the modulation used to encode the transmission signal.

  
According to a further particularly preferred embodiment, the device according to the invention is designed to generate a transmission signal coded by means of a frequency modulation. This is advantageous since known devices for detecting the occupancy or free state of a track section, for instance in the form of track circuits, frequently use transmission signals already encoded by frequency modulation. The reason for this is that frequency modulation is particularly insensitive to interference during transmission. In addition to the use of a frequency modulation, however, it is basically also possible to encode the transmission signal by means of an amplitude or a phase modulation.

   Preferably, the device according to the invention can also be so pronounced that it is designed to generate a transmission signal coded by means of a modulation in the form of a bit sequence. In the context of this preferred development of the device according to the invention, the transmission signal is thus coded by means of a digital modulation in the form of a bit sequence. This is advantageous because a corresponding digital modulation is particularly robust and insensitive to interference. In this case, the bit sequence may preferably be of arbitrary length, i. In particular, there is also the possibility that the bit sequence is infinitely long in that it is generated continuously and because of the nature of its generation is so arbitrary that there is no fixed bit pattern in the form that a part of the bit Follow regularly.

  
In principle, the comparison of the modulation of the received signal with the modulation of the transmitted signal can be carried out in any desired manner. If the device is designed to generate a transmission signal coded by means of a modulation in the form of a bit sequence, the device according to the invention can advantageously be configured such that it is designed for bitwise comparison of the modulation of the reception signal with the modulation of the transmission signal. In particular, compared to the use of fixed bit-rate coded codings, a bitwise comparison of the modulation of the received signal with the modulation of the transmitted signal is advantageous since such a comparison can be made very quickly.

   In addition, in contrast to the known procedure, the recovery time after a disturbance event with destruction of a transmitted bit is low, since the need for synchronization and evaluation of BitMustern predetermined length is eliminated. Ultimately, therefore, the availability of the device is increased due to the continuous information evaluation by the bitwise comparison.

  
According to a further particularly preferred development, the device according to the invention is designed for the continuous coding of the transmission signal. This means that there is a continuous, permanent coding of the transmission signal. This is advantageous in that at each point in time, the comparison between the modulation of the received signal and the modulation of the transmitted signal, the correct assignment between transmitter and receiver, i. the reception of the reception signal originating at the transmitter of the device can be verified and thus ensured. As an alternative to a continuous coding or modulation of the transmission signal, however, it is also conceivable, depending on the particular circumstances and circumstances, that only a temporary coding of the transmission signal takes place.

   On the one hand, this could be done, for example, such that encoding the transmit signal with the modulation only at regular recurring times, i. for example every 10 seconds. Furthermore, a corresponding modulation could in principle also be carried out only within the scope of a preferably regular functional test of the device.

  
According to a particularly preferred development of the device according to the invention, the device is designed to reliably compare the modulation of the reception signal with the modulation of the transmission signal. This is advantageous since this reliably prevents or avoids distortions or errors in the context of the comparison of the modulations. This is thus of great importance especially for all safety-critical devices for detecting the occupancy or free state of a track section.

  
As already mentioned above, if a deviation of the modulations is detected by the evaluation device when comparing the modulation of the reception signal with the modulation of the transmission signal, the device can indicate a busy condition with regard to the track section in question. In addition, the device according to the invention can advantageously be designed in such a way that, based on the comparison of the modulation of the reception signal with the modulation of the transmission signal, it is designed to generate an error signal indicating an interference condition. The error signal makes it possible to detect the present fault immediately and quickly and, on this basis, to remedy it as quickly as possible.

  
In principle, the generated error signal can be output in any manner. According to a further particularly preferred embodiment, the device according to the invention is designed to output the error signal in the form of an optical and / or acoustic warning message. This is advantageous since in a particularly fast and reliable manner operating personnel, for example an interlocking, can be made aware of the present fault.

  
Preferably, the device according to the invention can furthermore also be designed in such a way that the device for transmitting data signals via the rails of the track section is formed on a rail vehicle occupying the track section. This is advantageous since the device according to the invention can thus be used in a manner known per se in addition to the transmission of data signals to a rail vehicle. This means that the device according to the invention, in addition to the track release message, can also be used, for example, for line-shaped train control.

  
The present invention further relates to a method for operating a device for detecting the occupancy or free state of a track section, wherein a transmitted signal encoded by a modulation is fed into the rails of the track section and by a transmission of the transmission signal via the rails of the track section caused receive signal is received.

  
With regard to the method of the present invention has the object to provide a particularly simple and at the same time against interference particularly insensitive method of the aforementioned type.

  
This object is achieved according to the invention by a method for operating a device for detecting the busy or free state of a track section, wherein a transmission signal encoded by means of a modulation is fed into the rails of the track section, one by transmitting the transmission signal over the rails of the track section caused received signal is received and the modulation of the received signal is compared with the modulation of the transmitted signal.

  
The advantages of the method according to the invention essentially correspond to those of the device according to the invention, so that in this regard reference is made to the corresponding explanations above. The same applies with regard to the preferred developments of the method according to the invention mentioned below with regard to the corresponding preferred developments of the device according to the invention, so that reference is likewise made in this respect to the corresponding above statements.

  
Preferably, the method according to the invention can be configured in such a way that the transmission signal is coded by means of an arbitrary, in particular random-based, generated modulation.

  
According to a further particularly preferred embodiment of the method according to the invention, the transmission signal is coded by means of a frequency modulation.

  
Advantageously, the method according to the invention can also be so pronounced that the transmission signal is coded by means of a modulation in the form of a bit sequence.

  
Preferably, the inventive method can also run such that the modulation of the receive signal is compared bit by bit with the modulation of the transmit signal.

  
According to a further particularly preferred development of the method according to the invention, the transmission signal is coded continuously.

  
According to a particularly preferred embodiment, the method according to the invention is embodied such that the modulation of the receive signal is reliably compared with the modulation of the transmit signal in terms of signaling technology.

  
According to a further particularly preferred embodiment of the method according to the invention, an error signal indicating an interference condition is generated based on the comparison of the modulation of the reception signal with the modulation of the transmission signal.

  
According to a further particularly preferred embodiment of the method according to the invention, the error signal is output in the form of an optical and / or acoustic warning message.

  
Preferably, the method according to the invention can also be developed in such a way that data signals are transmitted to a rail vehicle occupying the track section via the rails of the track section.

  
In the following the invention will be explained in more detail with reference to an embodiment. This shows the

  
Figure for explaining an embodiment of the inventive method is a schematic sketch of an arrangement with a track section and an embodiment of the inventive device.

  
In the figure, a device V for detecting the busy or free state of a track section G is shown. The device V has a transmitter S for feeding a transmission signal SIGS in the form of an AC voltage in the rails F of the track section G. In addition, the device V comprises a receiver E for receiving a caused by the transmission of the transmission signal SIGS on the rails F of the track section G received signal SIGE.

  
As shown in the figure, an AC voltage of the frequency fl is fed to the track section G. In order to enable a reliable differentiation of the respective signals, the adjacent track sections are operated with an alternating voltage of different frequency f5 or f3. In the following, it is assumed that the arrangement shown in the figure is an audio frequency track circuit with a plurality of frequencies, in which an AC voltage in the form of a transmission signal SIGS in the audio frequency range is fed into the tracks F of the track section G.

  
The device V can be arranged for example in a signal box of a railway installation or a railway monitoring system. This offers the advantage that a particularly high level of reliability is achieved, since mechanical load and climatic influences with respect to the electronic components of the device V have a lower effect than would be the case if these components were accommodated close to the track. In addition, this provides further advantages in terms of availability and maintenance of the device V, i. in particular the transmitter S and the receiver E. By means of the horizontal dot-dash line in the figure, a corresponding separation between the indoor system, which is assigned to the device V, and the outdoor facility, to which the track section G belongs, indicated.

  
As shown in the figure are trackside

  
Track connection housing GAGL, GAG2 arranged, which serve for introducing the fed or provided by the transmitter S transmit signal SIGS or to read the signal E to the receiver E receive signal SIGE in or out of the rails F serve. Usually, the track connection housings GAG1, GAG2 do not contain any active electronic components, but essentially only a resonant circuit for frequency-selective amplification of the included or fed-out signals of predetermined useful frequency, i. in the case of the track section G of the transmission signal SIGS shown in the figure or of the reception signal SIGE of the frequency f1.

  
The transmission signal SIGS of the transmitter S is coded by means of a modulation. Corresponding codes are used to increase the reliability of interference, i. For example, reduce the likelihood of emulation of a corresponding coded transmission signal SIGS by noise amplitudes. In this case, corresponding disturbances on the one hand by external sources, on the other hand, by other devices V, i. For example, caused by nearby arranged track circuits.

  
In track circuits known from the prior art, a fixed predetermined, rigid coding is usually modulated on the transmitter side, and the coding is read out at the receiver end and compared with the predefined coding assigned to the respective track circuit. Due to the use of rigid bit patterns this can be a

  
Multiple use of the same bit pattern also with respect to the same signal frequency used are not completely excluded. This increases the noise pollution of the track circuits. Moreover, due to the synchronization required in relation to the fixed bit pattern and the evaluation of bit sequences of predetermined length required for this purpose, the recovery time after a disruption event with bit destruction is comparatively high. This leads in practice to a further restriction of the availability of the device.

  
In the embodiment according to the figure, the aforementioned disadvantages are avoided in that the device V is designed to compare the modulation of the reception signal SIGE with the modulation of the transmission signal SIGS. This makes it possible to verify that the reception signal SIGE received by the receiver E has actually been effected by the transmission signal SIGS fed by the transmitter S.

  
By comparing the reception signal SIGE with the transmission signal SIGs, it is advantageously made possible to generate a transmission signal SIGS coded by means of an arbitrary, in particular randomly generated, modulation and to feed it into the travel rails F of the track section G. In this case, the transmission signal SIG3 is preferably a transmission signal coded by means of a frequency modulation, whereby a continuous "bit-sequence stream" is preferably generated by the device V at random.

  
This bit-sequence current is modulated onto the transmission signal SIG3 and read out after the transmission via the rails F of the track section G by means of the reception signal SIGE on the receiver side.

  
According to the embodiment of the figure, the device V in addition to the transmitter S and the receiver E on an evaluation device AE. On the one hand, the evaluation device AE serves to generate the bit-following current, i. coding in the form of the continuous bit sequence. The generated bit sequence transmits the evaluation device AE to the transmitter S, which transmits the transmission signal SIG3 coded by the modulation in the form of the bit sequence for the purpose of being fed into the travel rails F of the track section G. On the other hand, the evaluation device AE also receives from the receiver E the reception signal SIGE or the coding determined from the reception signal SIGE in the form of the corresponding frequency modulation.

   This makes it possible for the evaluation device AE to perform a bitwise comparison of the modulation of the receive signal SIGE with the modulation of the transmit signal SIGs. A bitwise comparison offers the advantage that it can be executed quickly. Preferably, the evaluation device AE for fail-safe comparison of the modulation of the receive signal SIGE with the modulation of the transmit signal SIGS is formed. The signaling safety of the evaluation device AE can hereby be ensured by architecture measures which are known per se and which are necessary to achieve the security level usually required in the field of railway technology. Corresponding measures can include, for example, a continuous dual-channeling of the evaluation device and the use of secure computers.

  
According to the above statements, it is advantageously possible to dispense with rigid, predetermined bit patterns within the scope of the device according to the invention and the method according to the invention. In this way, and in particular by encoding the transmission signal by means of any modulation, in particular generated randomly, modulation between two devices, i. For example, track circuits, due to the same codes or bit information are practically excluded.

  
Overall, therefore, the present invention provides significant advantages in terms of reducing the amount of interference within a project or a plant. Due to the continuous information evaluation, i. the bitwise comparison, moreover, the availability of the device V increases, with complex synchronization depending on the length of a rigid bit pattern used, such as in the case of a bit destruction eliminated. Advantageously, it is also not necessary, by an appropriate configuration or configuration, such as by using so-called bit-pattern plug, transmitter and receiver side a the respective track section G or the respective device V of

  
Track section G each permanently assigned bit pattern set. As a result, the number of required for the device V components is reduced and saves time during assembly of the device V. In addition, the configuration is simplified by the fact that an assignment of bit patterns to track circuits in site plans and data sheets is not required. Furthermore, the application of the method according to the invention or of the device according to the invention leads to almost complete elimination of restrictions with respect to cable routing, since an extremely reliable check is possible as to whether a reception signal SIGE received by the receiver E is actually related to the respective one Track section G relates.

   The only exception here is that, in addition, the lines of the transmitter S and the associated receiver E of the same track section G or the same device V should be kept separate from each other in order to avoid coupling or crosstalk of the transmission signal SIGS in the line of the receiver E. According to the above explanations, an important reason why the cable routing restrictions can be eliminated is that, even in the case of a randomized generation of the bit sequence for encoding the transmit signal SIGS, identical bit sequences for different devices V are practically excluded can be.

  
In summary, therefore, to say that the embodiment of the device V according to the invention according to the figure, an increase in the immunity of the device V for detecting the busy or free state of the track section G allows, at the same time a simplification and associated cost reduction is achieved.

Claims

claims
1. A device (V) for detecting the busy or free state of a track section (G) with - a transmitter (S) for feeding a modulation encoded transmission signal (SIGs) in the rails (F) of the track section (G) and at least one Receiver (E) for receiving a reception signal (SIGE) caused by a transmission of the transmission signal (SIGS) via the rails (F) of the track section (G), characterized in that the device (V) for comparing the modulation of the reception signal (SIGE) is formed with the modulation of the transmission signal (SIGs).
2. Device according to claim 1, characterized in that the device (V) for generating a by means of any, in particular random-based generated, modulation encoded transmit signal (SIGS) is formed.
3. Apparatus according to claim 1 or 2, characterized in that the device (V) for generating a coded by a frequency modulation transmission signal (SIGS) is formed.
4. Device according to one of the preceding claims, characterized in that the device (V) for generating a coded by means of a modulation in the form of a bit sequence transmit signal (SIGS) is formed.
5. The device according to claim 4, characterized in that the device (V) for bitwise comparison of the modulation of the receive signal (SIGE) with the modulation of the transmit signal (SIGS) is formed.
6. Device according to one of the preceding claims, characterized in that the device (V) for continuously encoding the transmission signal (SIGS) is formed.
7. Device according to one of the preceding claims, characterized in that the device (V) for fail-safe comparison of the modulation of the receive signal (SIGE) with the modulation of the transmit signal (SIG3) is formed.
8. Device according to one of the preceding claims, characterized in that the device (V) based on the comparison of the modulation of the receive signal (SIGE) with the modulation of the transmit signal (SIGs) is designed to generate a fault condition indicating error signal.
9. Apparatus according to claim 8, characterized in that the device (V) is designed to output the error signal in the form of an optical and / or acoustic warning message.
10. Device according to one of the preceding claims, characterized in that the device (V) for transmitting data signals on the rails (F) of the track section (G) to a the track section (G) occupying rail vehicle is formed.
11. A method for operating a device (V) for detecting the busy or free state of a track section (G), wherein
- A transmitted signal encoded by a modulation signal (SIGS) in the rails (F) of the track section (G) is fed and
- Received by a transmission of the transmission signal (SIGS) on the rails (F) of the track section (G) receiving signal (SIGE) is received, characterized in that the modulation of the receive signal (SIGE) with the modulation of the transmission Signal (SIG3) is compared.
12. The method according to claim 11, characterized in that the transmission signal (SIGS) by means of any, in particular random-based generated, modulation is encoded.
13. The method according to claim 11 or 12, characterized in that the transmission signal (SIGS) is coded by means of a modulation in the form of a frequency modulation.
14. The method according to any one of claims 11 to 13, characterized in that the transmission signal (SIGs) is encoded by means of a modulation in the form of a bit sequence.
15. The method according to claim 14, characterized in that the modulation of the receive signal (SIGE) is bitwise compared with the modulation of the transmit signal (SIGS).
16. The method according to any one of claims 11 to 15, characterized in that the transmission signal (SIGS) is continuously encoded.
17. The method according to any one of claims 11 to 16, characterized in that the modulation of the receive signal (SIGE) is technically safe compared with the modulation of the transmit signal (SIG3).
18. The method according to any one of claims 11 to 17, characterized in that based on the comparison of the modulation of the receive signal (SIGE) with the modulation of the transmit signal (SIG3) an error condition indicating fault signal is generated.
19. The method according to claim 18, characterized in that the error signal is output in the form of an optical and / or acoustic warning message.
20. The method according to any one of claims 11 to 19, characterized in that on the rails (F) of the track section (G) DatensignaIe be transferred to a the track section (G) occupying rail vehicle.
PCT/EP2010/052247 2009-03-02 2010-02-23 Device for detecting the occupied state and the free state of a track section as well as method for operating such a device WO2010100054A1 (en)

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DE102009010907.2 2009-03-02
DE200910010907 DE102009010907A1 (en) 2009-03-02 2009-03-02 Device for detecting the occupancy and free status of a track section and method for operating such a device

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US13/254,532 US20110309204A1 (en) 2009-03-02 2010-02-23 Device for detecting the occupied state and the free state of a track section as well as method for operating such a device
CN2010800100669A CN102341289A (en) 2009-03-02 2010-02-23 Device for detecting the occupied state and the free state of a track section as well as method for operating such a device
EP20100706978 EP2403744A1 (en) 2009-03-02 2010-02-23 Device for detecting the occupied state and the free state of a track section as well as method for operating such a device

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US20110309204A1 (en) 2011-12-22
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