UP to discontinue cab signals.

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JeffLH

Member
On June 1st UP will retire cab signals over most of the UP system that are now equipped. Both Coded Cab Signals and the exCNW Automatic Train Control will be retired. No longer will equipped leaders be required, so foriegn power will now be allowed to lead over those lines that had cab signals.
 
On June 1st UP will retire cab signals over most of the UP system that are now equipped. Both Coded Cab Signals and the exCNW Automatic Train Control will be retired. No longer will equipped leaders be required, so foriegn power will now be allowed to lead over those lines that had cab signals.
It's my understanding that NS will not de-activate cab signals. The reason given is that PTC can only indicate clear, slow, or stop signal ahead; the cab signal system gives more information as to allowable speed, possible diverging move, etc.
 
It's my understanding that NS will not de-activate cab signals. The reason given is that PTC can only indicate clear, slow, or stop signal ahead; the cab signal system gives more information as to allowable speed, possible diverging move, etc.
It's the other way around. Cab signals only indicate the condition of the block you are in. PTC displays 5 miles ahead on screen, but "sees" the sixth mile ahead. You can see routes, slow track and work zones and PTC protects those items.

There's no reason cab signals like UP's CCS couldn't be used, the exCNW ATC is a bit different and not as compatible. UP has wayside block signals along almost all it's cab signal territory. They even have placed wayside signals over the years along the CNW which only had waysides at interlockings/controlled points. NS has removed some waysides on some of their cab signal territory. If PTC goes down, the cab signals or waysides still provide protection.
 




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