NS 21M has cleared the interlocking at CP Burn and is safely out of the block so 8637 starts 48G west towards Enola The big C39 and trailing SD70 put all their muscle into starting the train forward, the 7FDL16 power plant will be spinning at 1050 RPM at notch 8 and the locomotive is geared for 70 MPH with a continuous rating of 10.9 MPH.