Abstract: There is described a hi-rail device for mounting on a vehicle, comprising a linkage between an axle assembly for holding wheels and a mounting assembly. The linkage, pivotally connected to an upper pivot connection thereof, is foldable and unfoldable to translate the axle assembly relative to the upper pivot connection. An active suspension between the linkage and the mounting assembly is provided and comprises a suspension body to swivel about the mounting assembly, actuated by a spring proximally urging on the suspension body to provide the swivel. The suspension body comprising the upper connection to the linkage, which can move along with the suspension body to provide active suspension. Also, a locking pin, extending through the linkage, can be locked in a slot using a hydraulic cylinder, distinct from a hydraulic cylinder for deployment, and which comprises a spring for default locking not involving hydraulic power.

Abstract: There is described a hi-rail device comprising a cam assembly, an axle assembly and a locking pin. The cam assembly comprises a guiding slot which comprises a plurality of contiguous segments extending as a broken line, e.g., in a flattened M shape, wherein a first one and a last one of the contiguous segments extend in a downward slope with respect to a horizon. The locking pin inserted in the guiding slot and movable in translation within the guiding slot in which it is inserted. The axle assembly, in which the locking pin is inserted, has a weight applied on the locking pin which locks the locking pin in the lower end or the upper end of the guiding slot if the locking pin is in the first one or the last one of the four contiguous segments and no other force is applied thereonto.