B61J3/00—Shunting or short-distance haulage devices; Similar devices for hauling trains on steep gradients or as starting aids; Car propelling devices therefor
B61J3/08—Devices with reciprocated pushing bars or like driving mechanisms combined with the track for shunting or hauling cars
Outil a moteur a deux vitesses dont le passage d'une vitesse a l'autre est effectue automatiquement par un dispositif a came, tel que perceuses ou analogues