Abstract: In a method of lubricating a curved section of a railway track subjected to wear by the wheel-flanges of passing railroad vehicles the rail section is intermittently lubricated with lubricant from a lubricating shot-unit or metering-unit provided with a nozzle. The shots of lubricant may be controlled by using a signal voltage applied between the rails or by means of an electric transducer, an inductive transducer, a coupling clock or the like. Compressed air and/or lubricant is applied through lines to the metering-unit from separate storage containers arranged at a distance from the unit.In one embodiment a propelling-gas of reduced pressure is caused, via a control unit, to control in a pulse-like fashion a metering valve associated with said metering-unit.The invention also refers to an apparatus for the intermittent discharge of a working substance, e.g. grease for lubricating railway tracks, by means of a propelling-gas under high pressure such as nitrogen gas.

Abstract: A vehicle for operation on both road and railroad track is provided with a wheeled chassis comprising a steered front wheel axle and a rear wheel axle, both with road or rubber tire wheels. A front and a rear wheel axle are provided with rail wheels, the rear rail wheel axle being pivotable around a vertical axis relative to the wheel chassis. The rail wheel axles are vertically displaceable to be moved into engagement with the railroad track during the lifting of adjacent rubber tire wheels out of engagement with the ground. The rear rail wheel axle is located behind the rear wheel axle for road or rubber tire wheels of the vehicle and is turnable at least 180.degree. around the vertical axis. Preferably two parallel rear rail wheel axles are mounted on a bogie, which is turnable or rotatory relative to the wheeled chassis.