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Reply to "AC/DC mixed consists"

Engineer-Joe posted:
Hot Water posted:
Again, neither EMD nor GE designed their locomotives to "shut down" on a steep grade. For another example, when an EMD locomotive over-heated in a tunnel, the only thing that happens was; the "Hot Engine" alarm sounded, but the engine does NOT "shut Down".

 

Would the engineer just try to throttle back a bit to help or would/could just that engine be taken off line in extreme instances? (to help protect it with the train still rolling?)

No, as that would surely guarantee a stall, i.e.stopped on the grade.

Did they just carry on and hope for the best?

Pretty much.

Make it out into fresh air for the engine's conditions to get better?

Correct. That was the main reason that EMD developed the "Tunnel Cooling System Modification" for the Southern Pacific, resulting in what railfans and modelers call the "SD45T", "SD45T-2", and "SD40T-2" units (affectionally referred to as 'Tunnel Motors'). 

 

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