MetraUPWest
Service Attendant
Amtrak's P42s (like almost all other passenger locomotives) are equipped with standard range dynamic brakes. Standard range dynamics brakes aren't effective at speeds below 25mph. At 15mph they are practically useless- they only have half the strength at 15mph that they have at 25mph. You wouldn't be able to hold the train to 15mph on a downgrade using only dynamics.
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