US3811382A - Process for packing and leveling railway tracks and device for performing the same - Google Patents

Process for packing and leveling railway tracks and device for performing the same Download PDF

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Publication number
US3811382A
US3811382A US00263974A US26397472A US3811382A US 3811382 A US3811382 A US 3811382A US 00263974 A US00263974 A US 00263974A US 26397472 A US26397472 A US 26397472A US 3811382 A US3811382 A US 3811382A
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United States
Prior art keywords
track
level
sleepers
tamping
tool
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Expired - Lifetime
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US00263974A
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English (en)
Inventor
J Buchter
H Jaeggi
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Matisa Materiel Industriel SA
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Matisa Materiel Industriel SA
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/12—Packing sleepers, with or without concurrent work on the track; Compacting track-carrying ballast
    • E01B27/13—Packing sleepers, with or without concurrent work on the track
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/02—Placing the ballast; Making ballastway; Redistributing ballasting material; Machines or devices therefor; Levelling means
    • E01B27/021—Placing the ballast; Making ballastway; Redistributing ballasting material; Machines or devices therefor; Levelling means by devices moving underneath the track, e.g. ballast sleighs
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
    • E01B27/12—Packing sleepers, with or without concurrent work on the track; Compacting track-carrying ballast
    • E01B27/13—Packing sleepers, with or without concurrent work on the track
    • E01B27/16—Sleeper-tamping machines
    • E01B27/17—Sleeper-tamping machines combined with means for lifting, levelling or slewing the track
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
    • E01B29/04—Lifting or levelling of tracks
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/01—Devices for working the railway-superstructure with track
    • E01B2203/015—Devices for working the railway-superstructure with track present but lifted
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/08—Levelling ballast or ground beneath
    • E01B2203/083—Ploughs
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/10—Track-lifting or-lining devices or methods
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/12—Tamping devices
    • E01B2203/127—Tamping devices vibrating the track surface
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B2203/00—Devices for working the railway-superstructure
    • E01B2203/16—Guiding or measuring means, e.g. for alignment, canting, stepwise propagation

Definitions

  • the present invention has for its object a highly efficient process for packing railway tracks by compacting ballast beneath the sleepers by a continuous forward movement along the section of the track to be packed, as well as a device for performing said process.
  • the object of the present invention is to pack a railway track by the continuous forward movement, avoidin g the difficulties of the processes of the first type, and using for the packing a combination of the processes of the second type with a prior introduction of ballast beneath the sleepers.
  • the process according to the invention is characterised in that it comprises simultaneously performing two interdependent operations in two different zones, namely in a first zone introducing ballast beneath the sleepers and forming for said sleepers a new support surface, and in a second zone vertically tamping this support surface by applying to the rails and sleepers a vertical pulsating force.
  • the ballast can be introduced beneath the sleepers in any appropriate manner, either laterally from the sides of the track, using for example, ploughs, or longitudinally from the sleeper cases to form a new support surface for the sleepers which is leveled out with the aid for example of leveling tools.
  • lt is advantageous during this ballast introduction operation to regulate the level of this new support surface for the sleepers as a function of the desired track level after packing, taking account of the track subsidence caused by the packing system used with this working method.
  • This regulation operation can be performed in two ways:
  • the track is raised and maintained raised in a continuous manner, substantially at the point of introducing the ballast beneath the sleepers, at the desired level defined for example by a leveling reference base of conventional design and the ballast is introduced beneath the sleepers until the base created thereunder by the raising operation is filled.
  • ballast support surface level itself is regulated to a level such that the track when placed on said surface is located at the desired level.
  • the tracks subsidence caused by the tamping is also regulated as a function of the desired level of the track so as to re-establish this constant.
  • This supplementary regulation operation can be performed in two ways:
  • the regulation is corrected at the level of the new support surface of the sleepers as a function of the variations detected between the level of the track measured behind the tamping zone and the desired level.
  • the regulation of the level of the new sleeper support surface is corrected by introducing more or less ballast beneath the same, so that after tamping the track level is the desired track level.
  • the invention also has for its object a device for performing the process described, which is able to move along a railway track and to pack same by compacting the'ballast beneath the sleepers by a continuous forward movement, said device being characterised in that it comprises simultaneously at least one tool applying to the rails andsleepers a vertical pulsating force for tamping the ballast beneath the sleepers and at least one tool preceding the other introducing ballast beneath said sleepers.
  • said device is equipped:
  • ballast leveling tool for bringing the ballast from the sleeper cases to beneath the sleepers and leveling the support surface of said sleepers, track lifting members located close to the leveling tool and-a control mechanism for the vertical position of the leveling tool connected to a measuring member, whereof the sensing device connected to the leveling tool senses the level of said tool by reference to a leveling base.
  • the device according to the invention comprises:
  • either a second control mechanism for varying at least one of the parameters of the pulsating force of the tamping tool said control mechanism being connected to a second measuring member, whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the level of the track by reference to the above-mentioned leveling base,
  • control mechanism for varying the rate of advance of the device, said control mechanism being connected to a second measuring member, whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the track level by reference to the above-mentioned leveling base.
  • An embodiment of the device of the invention is shown in the attached drawing, in a preferred form permitting the correction of the regulation of the sleeper support surface level.
  • FIG. 1 of the drawing' shows an elevation of said device
  • FIG. 2 shows a variant of the equipment permitting the introduction of the ballast beneath the sleepers
  • FIG. 3 is a perspective view showing in a more detailed manner the tool of FIG. 2.
  • FIG. I In the-device shown in FIG. I is a railway working machine, whereof the chassis 2 rests on the track via two bogies 4 and 5, whereof one 4 is equipped with driving wheels driven in a known manner via adrive using a motor 6 coupled to a speed variator 7.
  • This motor can also drive a generator and a hydraulic pump, which are not shown, to supply all the auxiliary equipment of the device.
  • This device also comprises a reference leveling base line, here shown schematically by the straight line 8, parallel to the desired level 9 of the track.
  • This reference base can be substantially in any known form, for
  • the machine chassis supports via 2 height-regulatable suspension members such as hydraulic jacks II and 12, a ballast leveling tool I3 of conventional design, which-extends over the complete width of the track and which advantageously but not necessarily vibrates and is held at the front by an extensible tie rod 14;
  • a ballast leveling tool I3 of conventional design, which-extends over the complete width of the track and which advantageously but not necessarily vibrates and is held at the front by an extensible tie rod 14;
  • Another hydraulic jack .15 placed between the two mentioned hereinbefore drives a prehension roller 16 to raise the track to an adequate predetermined level in order topermit the free passage beneath the track of the leveling tool.
  • a tamping tool which can comprise, as shown in the drawing, a flange 17 provided with antifriction material such as teflon to slide along the rail, to said flange is fixed a vibrator 18 connected to a jcak 19, via an elastic connection such as a spring 20.
  • This jack is supported at 21 on the machine chassis and permits the raising of the tamping tool as well as the application of a regulatable vertical static force on said tool.
  • the tamping flange is held at the front by an extensible tie rod 22.
  • the vibrator I8 is operated in such a way that it is possible to vary the frequency and amplitude of the vibrations caused.
  • a sensing device 23 fixed to the leveling tool 13 permits the determination of the level of the lower working variation e, relative to the reference base 8.
  • This variation e is measured by an electronic comparison system 26 connected to the base and to the sensing device and transformed into a control signal S,,.
  • the second sensing device 27 connected to the rail to the rear of the tamping flange 17 permits the determination of the level of the upper face of the rail head by measuring the variation e relative to the reference base 8.
  • This variation e is measured by a second electronic comparison system 28 connected to the base and to the sensing device and transformed into a corrective signal Se
  • This correction signal Se as it is or further corrected if necessary by means of adjustment member 30 is directed to a summation apparatus 31 which also receives control signal S
  • the resulting signal 5,, Se, of this summation is then used as the signal for controlling the regulation of the level of leveling tool 13 which can for example take place by means of a solenoid valve supplying jacks 11 and 12 with fluid until the cancelling out of the resulting signal or by any other known regulation system.
  • the level of the new support surface of the sleepers is always regulated as a function of the possible variations in the degree of settling of the ballast caused by the tamping operation, so that the track level after packing corresponds to the desired level 9 or is higher than this level by a predetermined value, which is introduced into the regulation chain by means of adjustment member 30.
  • FIGS. 2 and 3 show a variant of the tool for introducing ballast beneath the sleepers'ln this case it is a type of a plough having a plough share 32 in front of a member 33, said plough can advantageously vibrate in the direction transverse to the track.
  • This plough is connected to the machines chassis 2 by means of two height-regulatable members such as hydraulic jacks I1 and 12'.
  • a third jack 15' such as that in FIG. 1 for rais ing the track is placed preferably between the two first jacks substantially upright to the plough.
  • the regulation shown in part, is the same as that for FIG. 1, except that the lifting control acts on the lifting jack 15' instead of acting on the lifting of the leveling tool and that the sensing device 23' senses the upper level of the rail head instead of the lower face of the leveling tool.
  • ploughshare 32 introduces ballast beneath the sleepers by pushing it along the vertical inclined plane 34 in such a way as to fill the space made by the raising operation then the member 33 forces the ballast under the ends of the sleepers thus filling the space left by the passage of the ploughshare.
  • This device as described and illustrated by FIGS. 1, 2 and 3 in its preferred form also contain members permitting the performance of the other variants defined in the introduction.
  • circuit shown by short broken lines B it is also possible with the circuit shown by short broken lines B to directly use the signal S to vary one of the pulsating tamping force parameters, i.e. either the frequency of the vibrations or the intensity of the vertical static force or with the circuit represented by spaced broken lines C to use said circuit S to vary the rate of forward movement of the machine by acting on the speed variator 7 of said machine.
  • the circuit shown by short broken lines B directly use the signal S to vary one of the pulsating tamping force parameters, i.e. either the frequency of the vibrations or the intensity of the vertical static force or with the circuit represented by spaced broken lines C to use said circuit S to vary the rate of forward movement of the machine by acting on the speed variator 7 of said machine.
  • the first operation comprising: raising the track in the first zone, and introducing ballast beneath the raised sleepers and forming for said sleepers a new support surface at such a level that when the track is laid again on said new support surface, it is at a level which is above the desired track level;
  • the second operation comprising: vertically tamping in the second zone said support surface by applying to the rails a vertical pulsating force until the track is lowered at the desired track level.
  • Device able to move along a railway track and to pack the same by compacting the ballast beneath the sleepers by continuous forward movement, said device having means for raising the track such as raise tongs with rollers and means for checking the height position of the track with reference to a leveling base, wherein said device comprises at least one tool introducing ballast beneath the sleepers of the track in a first zone where the track is raised, said tool followed by at least one tamping tool applying to the rails a vertical pulsating force in a second zone where the track is laid.
  • Device comprising at least two lateral ploughs one on each side of the track for bringing the ballast from the shoulders to beneath the sleepers, wherein said device further comprises a control mechanism of the vertical position of the raising means connected to a measuring device whereof the sensing device, connected to the rails substantially upright to the ploughs, senses the track level by reference to the leveling base.
  • Device comprising a'second control mechanism for varying at least one of the pulsating force parameters of the tamping tool, said control mechanism being connected to a second measuring device whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the track level by reference to the leveling base.
  • Device comprising a second control mechanism for varying the advance rate of the device, said control mechanism being connected to a second measuring device whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the track level by reference to the leveling base.
  • Device comprising a corrective device of the control mechanism of the vertical position of the track raising means connected to a second measuring device whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the track level by reference to the leveling base.
  • Device having at least one ballast leveling tool for bringing the ballast from the sleeper cases to beneath the sleepers and leveling the support surface thereof, wherein said. device further comprises a control mechanism of the vertical position of the ballast leveling tool connected to a measuring device whereof the sensing device connected to the ballast leveling tool senses the level of said tool with reference to the leveling base.
  • Device comprising a second control mechanism for varying at least one of the pulsating force parameters of the tamping tool, said control mechanism being connected to a second measuring device whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the track level by reference to the leveling base.
  • Device comprising a second control mechanism for varying the advance rate of the device, said control mechanism being connected to a second measuring device whereof the sensing device connected to the rails to the rear or upright to the tamping tool senses the track level by reference to the leveling base.
  • Device according to claim 13 comprising a corrective device of the control mechanism of the vertical position of the ballast leveling tool connected to a second measuring device whereof the sensing device connected to the rails to the rear or uprightto the tamping tool senses the track level by reference to the leveling base.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
US00263974A 1971-07-07 1972-06-19 Process for packing and leveling railway tracks and device for performing the same Expired - Lifetime US3811382A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH995371A CH541028A (fr) 1971-07-07 1971-07-07 Procédé de bourrage des voies ferrées et dispositif pour sa mise en oeuvre

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US3811382A true US3811382A (en) 1974-05-21

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US (1) US3811382A (it)
CH (1) CH541028A (it)
DE (1) DE2231670A1 (it)
FR (1) FR2145179A5 (it)
GB (1) GB1400625A (it)
IT (1) IT972427B (it)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943857A (en) * 1973-09-02 1976-03-16 Franz Plasser Bahnbaumaschinen Industriegesellschaft Mbh Track surfacing
US4046078A (en) * 1975-01-31 1977-09-06 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Track surfacing apparatus
US4064807A (en) * 1975-08-18 1977-12-27 Franz Plasser Bahnbaumaschinen Industriegesellschaft M.B.H. Mobile apparatus for non-stop track leveling and ballast tamping
US4119154A (en) * 1977-02-18 1978-10-10 Southern Railway Company Method and apparatus for treating ballast
US4125075A (en) * 1977-03-18 1978-11-14 Canron, Inc. High speed production tamper compactor
US4136618A (en) * 1977-06-06 1979-01-30 Boyer Jean Jacques Railroad lifting device for ballast cleaning and levelling machines
US4170942A (en) * 1976-10-04 1979-10-16 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Mobile leveling, lining and ballast packing machine
US4178995A (en) * 1976-05-31 1979-12-18 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Self-propelled ballast cleaning machine for on- and off-track work
US4535700A (en) * 1981-02-17 1985-08-20 Canron Inc. Device for tamping railroad track adjacent the tie ends thereof
US4760796A (en) * 1986-04-02 1988-08-02 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Ballast cleaning machine with compacting device
US4890557A (en) * 1989-01-13 1990-01-02 Kershaw Manufacturing Company, Inc. Interstitial ballast vibrator
US20030159316A1 (en) * 2000-06-14 2003-08-28 Allen John Phillip Track sledding machine
US20040211092A1 (en) * 2003-04-22 2004-10-28 Tommy Barnes Padding machine and method of use
ES2397739A1 (es) * 2011-11-25 2013-03-11 José Antonio IBÁÑEZ LATORRE máquina y método de mantenimiento de vía férrea para nivelación, alineación, compactación y estabilicación de vía, con capacidad de operar sin interrupciones en su avance.
US20190316299A1 (en) * 2018-04-16 2019-10-17 Bnsf Railway Company System, method and appartus for in-situ, dynamic repair of a railroad

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT518024B1 (de) * 2015-11-18 2018-04-15 Hp3 Real Gmbh Gleisfahrbare Gleisverdichtmaschine
CN112442927A (zh) * 2019-09-02 2021-03-05 中国铁道科学研究院集团有限公司铁道建筑研究所 一种捣固车前端偏差测量方法

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US2989930A (en) * 1953-07-09 1961-06-27 Flowers Henry Fort Railroad ballast car body and ballast spreader mechanism
US3491467A (en) * 1965-10-29 1970-01-27 Matisa Materiel Ind Sa Method and equipment for regulating ballast of a railway track
US3545384A (en) * 1967-05-22 1970-12-08 Plasser Bahnbaumasch Franz Method and apparatus for correcting the position of a track
US3605297A (en) * 1968-08-05 1971-09-20 Marmon Group Inc Railroad ballast plow
US3610157A (en) * 1969-06-11 1971-10-05 Mikhail Antonovich Plokhotsky Machine for constructing and repairing railway tracks
US3621785A (en) * 1970-08-06 1971-11-23 Morrison Knudsen Co Ballast spreader and compactor
US3625156A (en) * 1969-09-05 1971-12-07 Jackson Vibrators Ballast tamping workhead
US3638578A (en) * 1968-04-24 1972-02-01 Robel & Co Apparatus for consolidating a track bed
US3685456A (en) * 1969-10-07 1972-08-22 Plasser Bahnbaumasch Franz Method and apparatus for the continuous replacement of an old track by a new track

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2989930A (en) * 1953-07-09 1961-06-27 Flowers Henry Fort Railroad ballast car body and ballast spreader mechanism
US3491467A (en) * 1965-10-29 1970-01-27 Matisa Materiel Ind Sa Method and equipment for regulating ballast of a railway track
US3545384A (en) * 1967-05-22 1970-12-08 Plasser Bahnbaumasch Franz Method and apparatus for correcting the position of a track
US3638578A (en) * 1968-04-24 1972-02-01 Robel & Co Apparatus for consolidating a track bed
US3605297A (en) * 1968-08-05 1971-09-20 Marmon Group Inc Railroad ballast plow
US3610157A (en) * 1969-06-11 1971-10-05 Mikhail Antonovich Plokhotsky Machine for constructing and repairing railway tracks
US3625156A (en) * 1969-09-05 1971-12-07 Jackson Vibrators Ballast tamping workhead
US3685456A (en) * 1969-10-07 1972-08-22 Plasser Bahnbaumasch Franz Method and apparatus for the continuous replacement of an old track by a new track
US3621785A (en) * 1970-08-06 1971-11-23 Morrison Knudsen Co Ballast spreader and compactor

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943857A (en) * 1973-09-02 1976-03-16 Franz Plasser Bahnbaumaschinen Industriegesellschaft Mbh Track surfacing
US4046078A (en) * 1975-01-31 1977-09-06 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Track surfacing apparatus
US4064807A (en) * 1975-08-18 1977-12-27 Franz Plasser Bahnbaumaschinen Industriegesellschaft M.B.H. Mobile apparatus for non-stop track leveling and ballast tamping
US4178995A (en) * 1976-05-31 1979-12-18 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Self-propelled ballast cleaning machine for on- and off-track work
US4170942A (en) * 1976-10-04 1979-10-16 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Mobile leveling, lining and ballast packing machine
US4119154A (en) * 1977-02-18 1978-10-10 Southern Railway Company Method and apparatus for treating ballast
US4125075A (en) * 1977-03-18 1978-11-14 Canron, Inc. High speed production tamper compactor
US4136618A (en) * 1977-06-06 1979-01-30 Boyer Jean Jacques Railroad lifting device for ballast cleaning and levelling machines
US4535700A (en) * 1981-02-17 1985-08-20 Canron Inc. Device for tamping railroad track adjacent the tie ends thereof
US4760796A (en) * 1986-04-02 1988-08-02 Franz Plasser Bahnbaumaschinen-Industriegesellschaft M.B.H. Ballast cleaning machine with compacting device
US4890557A (en) * 1989-01-13 1990-01-02 Kershaw Manufacturing Company, Inc. Interstitial ballast vibrator
US20030159316A1 (en) * 2000-06-14 2003-08-28 Allen John Phillip Track sledding machine
US7316084B2 (en) * 2000-06-14 2008-01-08 Queensland Rail Track sledding machine
US20040211092A1 (en) * 2003-04-22 2004-10-28 Tommy Barnes Padding machine and method of use
ES2397739A1 (es) * 2011-11-25 2013-03-11 José Antonio IBÁÑEZ LATORRE máquina y método de mantenimiento de vía férrea para nivelación, alineación, compactación y estabilicación de vía, con capacidad de operar sin interrupciones en su avance.
WO2013076332A1 (es) * 2011-11-25 2013-05-30 Ibanez Latorre Jose Antonio Máquina y método de mantenimiento de vía férrea para nivelación, alineación, compactación y estabilización de vía, con capacidad de operar sin interrupciones en su avance
US9382668B2 (en) 2011-11-25 2016-07-05 Jose Antonio Ibañez Latorre Machine and method for railway track maintenance, for track levelling, alignment, compaction and stabilisation, capable of operating without interrupting the forward movement thereof
US20190316299A1 (en) * 2018-04-16 2019-10-17 Bnsf Railway Company System, method and appartus for in-situ, dynamic repair of a railroad
US10760222B2 (en) * 2018-04-16 2020-09-01 Bnsf Railway Company System, method and appartus for in-situ, dynamic repair of a railroad

Also Published As

Publication number Publication date
DE2231670A1 (de) 1973-01-18
GB1400625A (en) 1975-07-16
FR2145179A5 (it) 1973-02-16
CH541028A (fr) 1973-08-31
IT972427B (it) 1974-05-20

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