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| Re: For the Interurban Fan (1223711) | |||
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Re: For the Interurban Fan |
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Posted by randyo on Mon May 20 15:41:37 2013, in response to Re: For the Interurban Fan, posted by Avid Reader on Mon May 20 11:41:15 2013. The washboards had essentially the same braking system as the 4500, 4600 and 4700 NYC MUs (the ACMUs) which was a D22MUE system on the washboards and 4500s and a 26CMUE on the later NYC MUs. The 4500s had M-40D brake valves and the washboards and later NYVMUs had M38 brake valves which while not identical essentially performed the same function. The North Shore Electroliners and BMT Multis had an almost identical brake system but an earlier version referred to as AMCE with the Multis having an ME 39 brake valve instead of the M-38. The brake system was essentially an electro pneumatic straight air brake system combined with an automatic brake system in the event of an EP failure. Although this system was the forerunner of the SMEE as used on NYCTS, on those systems, the straight air only functioned in and electro pneumatic mode. If the EP failed, straight air would not apply ant the automatic reduction brake positions on the brake valve would have to be used to stop the train. On the Multis, there was a protection feature that provided an emergency brake application if the straight air pressure did not correspond to what was called for by the position of the brake valve but no such feature existed on any of the RRs' MUs. I was told by an MN employee that at some point a few years ago, the FR outlawed the M-38 and similar brake valves and at least on the 1100 series (former 4600 and 4700) ACMUs, the M-38 brake valves were replaced by 26 type self lapping reduction brake valves like those on the Jersey arrows and SEPTA silverliners which lacked the straight air feature but retained the electro pneumatic feature. Whether that FRA ruling coincided with the removal of the washboards, I don't know, but if there is anyone out there from M/N or is otherwise familiar with any such FRA ruling, feel free to make any additions or corrections to the info I have. |
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