I have a few questions which I have never been able to get a straight answer to from mechanical people at work.
My first question is about the #6 brake system, with 2 pipe MU. How did that system send the pressure to actuate to a trailing system? How does this work with a 26 system? I have seen various MU2A valves. Some have the positions "trail 6 or 26", "trail 24" or "lead". If the 26 is leading, how is it set up to know whether or not to send the bail signal via the actuation line?
Isn't there one version of the #6 which uses 3 lines? I have seen some bastardized conversions. The ex CB&Q SD9s had #6 brakes, but the independent had been replaced with a SA26 independent brake valve, and a MU2A valve.
What is the difference between 26L, and 26LUM? I see the LUM on many CP SD40s. The used ones, like the ex MP and KCS units have straight 26L.
My first question is about the #6 brake system, with 2 pipe MU. How did that system send the pressure to actuate to a trailing system? How does this work with a 26 system? I have seen various MU2A valves. Some have the positions "trail 6 or 26", "trail 24" or "lead". If the 26 is leading, how is it set up to know whether or not to send the bail signal via the actuation line?
Isn't there one version of the #6 which uses 3 lines? I have seen some bastardized conversions. The ex CB&Q SD9s had #6 brakes, but the independent had been replaced with a SA26 independent brake valve, and a MU2A valve.
What is the difference between 26L, and 26LUM? I see the LUM on many CP SD40s. The used ones, like the ex MP and KCS units have straight 26L.