For Fremont descend scenario you are instructed to set the selector lever in position 4. This should be position 1. I think for Fremont ascend you have the same bug.
I think, it should be set to "B". No power is needed to move this train at start. Gravity make a job, just put dynamic brake on to fight with this mighty force.
It's incorrect, but it doesn't matter since for game purposes 1, 2, 3 and 4 in the SD40 are interchangeable.