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Well Wabash, I don't know for sure if the older units (I may be wrong) not equipped with IFC (GE) and ICE/FIRE (EMD) sand automatically in emergency. The computer controlled units do sand automatically. The computer contolled units (newer dash 9s, Macs, SD70Ms) sand whenever the PCS valve opens except when DP/IDP linking operations are done, as far as I know. So if an in train seperation occurs or an operator emergency is initiated the leading axle sanders do come on. I am pretty sure of the info that I am giving you through my experience as a conductor and now hostler (that is all that I can hold, slow season, low seniority). If you want the good dope on this you need to ask an engineer who has been through the training program. In conductor and hostler training we were given the basics on loco operation. But, that is the best that I can offer you. Hope I helped.......Oh yeah, you can also sand manually at any speed via a manual sander button on the engineer's console. They will also sand automatically if wheel slip is sensed.
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