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| Re: Brake Valve portion Re: LIRR MP-54 #1149 and its ME-23 brake valve (485360) | |||
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Re: Brake Valve portion Re: LIRR MP-54 #1149 and its ME-23 brake valve |
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Posted by randyo on Mon Sep 3 20:19:02 2007, in response to Re: Brake Valve portion Re: LIRR MP-54 #1149 and its ME-23 brake valve, posted by SelkirkTMO on Mon Sep 3 14:23:59 2007. AMRE usually had an ME-21 brake valve which had an entirely different method of operation from an ME-23. The Positions from left to right on an ME-21 are: release, electric holding, electric application, lap (which is also handle off), intermediate pneumatic service, full pneumatic service, and emergency. Since the electric application positionon the ME-21 is pneumatically a charging position, the M/M would have a problem stopping the train in the event of an electrical failure. To deal with this, if the electric feed were interruoted for any reason, the brakes would apply in emergency as long as the electric brake switch is engaged. In order to proceed using only the pneumatic brake, the M/M would have to cut out the electric brake switch which would disable the emergency feature and allow the brakes to be operated pneumatically. The old H & M black cars as well as the oder Boston rapid transit cars had a similar system but they used ME-15 and ME-17 brake valves which slightly different in appearance, had the identical positions to the ME-21. |
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