Sylvian Tennant Posted January 7, 2018 Share Posted January 7, 2018 Hello again Just another quick question. How was the push pull equipment controlled on airbraked locomotives such as the M7. Did it use the same equipment as the air braking? or was there duplicate equipment used? If so how did it work? Link to post Share on other sites More sharing options...
IWCR Posted January 7, 2018 Share Posted January 7, 2018 Hello I dont think any M7s were air braked. Isle of Wight 02s were though (2 had push pull equipment) and obviously many LBSC locos. The air supply for brake and control is all from the same Westinghouse pump. This fed a storage reservoir which supplied air to the drivers brake valve and the control system. A vacuum braked engine with air push pull equipment would normally have a small Westinghouse pump as it supplies control air only. An air braked engine would normally have a larger pump as a lot more air is needed. Air is supplied from the storage reservoir to both the engines cab and the cab of the driving trailer The control air system operates via a control valve operated by the driver when in the Driving Trailer, this activates a dual acting air cylinder on the engine which moves the regulator. An air whistle is also fitted to the Driving Trailer. The fireman remaining on the engine would operate the reversing leaver according to bellcode instructions from the driver. The Driving Trailer also uses the storage air to supply a standard Drivers Brake valve which operates the train brake. When working engine first the pin connecting the push pull operating cylinder to the regulator is removed and the engine worked normally. Pete Link to post Share on other sites More sharing options...
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