Single engine passes - why did (o)T(o) continue operating?

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BNSFEng

Locomotive Engineer!!!
Sounds like the one of the comments had the answer. It was a loss of shunt so it stays on longer to ensure safety. BNSF requires us to move prepared to stop if we have less than 12 axles if the lights or gates don't activate.
 

Robert Gift

former OL presenter
Sounds like the one of the comments had the answer. It was a loss of shunt so it stays on longer to ensure safety. BNSF requires us to move prepared to stop if we have less than 12 axles if the lights or gates don't activate.
Interesting! Thank you.
If loss of shunt, why would the (o)T(o) continue operation?
Would the signal system not react as though the train backed out of that insulated section of track?

In San Rafael, CA, the track had a bead welded down the center of the rails from one end of the grade crossing circuit to the other. Presumably to ensure sufficient electrical contact on rails which quickly rust in the humid environment.
 




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