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| Re: Brake Valve portion Re: LIRR MP-54 #1149 and its ME-23 brake valve (485027) | |||
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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 Bill West on Mon Sep 3 05:21:58 2007, in response to Re: Brake Valve pr0n Re: LIRR MP-54 #1149 and its ME-23 brake valve, posted by Jeff H. on Mon Sep 3 02:38:59 2007. You night hawks out there, I didn’t think I would have to answer this until morning.Selkirk, The impression I got was that although mounted in the brake stand the fifth contact was nothing to do with any part of the brake equipment. It did not seem to involve any piping nor the “E” valve wiring, that was already accounted for. Also in my pict it is identical in appearance to the others, the only difference is that it has its own mounting insulator base, no difference in finger length. So are we into Company differences? The division between brake and propulsion supplier‘s drawings is one that has annoyed me all along in this hobby. An EMD manual will tell you all but what grade of TP to use in the loco but it will tell you zilch about the all important brake system. Maybe we’ve got the same problem here, that Big W Traction Brake’s interest stops when that wire exits the valve casing and goes to WEMCO. Seems silly here when East Pittsburgh is only a few miles down Turtle Creek from Wilmerding but maybe they knew too well what the other was doing to think of telling the rest of us. Jeff, I think you’ve got a very substantial explanation there, it sounds very slick and covers all the points of concern. I have to wonder if getting into parallel wasn’t an essential step for getting braking force however, but was merely to get it to a useful level. Otherwise I think you’ve got the sensible story for the era. You are also right about the existence of arcane difference in model numbers, the difference in 6ET’s distributing valve from 6 to 6E is 4/64 of an inch in a port size and a stiffer spring. I have made a CAD chart of Westinghouse brake schedules and it covers a few pages just to do mainline equipment let alone subway or street railway equipment. I think I have been rightfully hesitant to publish because it is clear that this is a complex area to document and thus I have glaring errors but may be one day we’ll get it settled down before the old heads have moved on. Bill |
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