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Re: Merolink looking at design flaw in "crash resistant" cars....
Author: Dr Zarkoff
Date: 09-04-2015 - 13:56
>Does the absence of a COMM line on freight locomotives make any difference,
One pair of wires the MU cable has been reserved for data transmission for decades, but this has nothing to do with the separate transit/passenger communication cable. While there is an AAR standard for the MU cable, there is no corresponding APTA standard for comm cables, so each operation has its own wire designations and usage.
>or do they have to disable the door interlocks on the passenger unit for it to load?
I more than suspect that when leading, the BNSF locomotive will load and operate just fine, even if all the doors in the train are completely open, unless Metrolink adapts the BNSF engine's control circuits for door open/closed detection (which would be a bit expensive and involved). It's possible the Metrolink loco on the other end wouldn't load.
Re the Metrolink loco when it's controlling: its loading depends on how the door circuits are wired into the locomotive's control system. If they are wired to isolate the throttle from the MU lines, the BNSF engine on the other end won't load either. However, if the doors control something between the MU wires and the loco's internal electrical system, then the BNSF loco will probably load.
One pair of wires the MU cable has been reserved for data transmission for decades, but this has nothing to do with the separate transit/passenger communication cable. While there is an AAR standard for the MU cable, there is no corresponding APTA standard for comm cables, so each operation has its own wire designations and usage.
>or do they have to disable the door interlocks on the passenger unit for it to load?
I more than suspect that when leading, the BNSF locomotive will load and operate just fine, even if all the doors in the train are completely open, unless Metrolink adapts the BNSF engine's control circuits for door open/closed detection (which would be a bit expensive and involved). It's possible the Metrolink loco on the other end wouldn't load.
Re the Metrolink loco when it's controlling: its loading depends on how the door circuits are wired into the locomotive's control system. If they are wired to isolate the throttle from the MU lines, the BNSF engine on the other end won't load either. However, if the doors control something between the MU wires and the loco's internal electrical system, then the BNSF loco will probably load.
