Abstract: In an electronically controlled RAILWAY locomotive throttle controller system having a central processor unit and a plurality of trainlines, such trainlines carrying binary voltage signals derived from corresponding binary signals in such central processor unit, a method for transmitting, for a group of said trainlines, herein numbered as NT, the binary voltage signals back to such central processor unit for diagnostic purposes. Such method includes the steps of applying, for the group of NT trainlines, their binary voltage signals to a frequency generator which will generate a signal having a frequency characteristic of such binary voltage signals. The frequency having a different value for every possible combination of binary signals from such trainlines.

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.