Abstract: A railway vehicle having pneumatic actuated devices connected to a pneumatic system including a refillable supply tank connected to the control and actuation elements of the pneumatic devices is provided with a device for coupling the supply tank to a source of pressure medium as the vehicle approaches the source. The apparatus comprises a supply funnel on the vehicle connected to the supply tank and a supply nozzle connected to a source of pressure medium at a station. The supply nozzle is provided with receiver means. On the vehicle there is provided contact means which are engageable with the receiver means as the vehicle enters the station to align coaxially the funnel and nozzle and to impart relative longitudinal movement between the funnel and nozzle to couple these elements in tight coupled position. The funnel and nozzle are each provided with check valves which are opened simultaneously upon coupling of the funnel and nozzle.