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I think that they had to use wooden blocks because the loco was in a yard (no room for heavy equipment) and the track was bowing out from the joiners. (so cranes won't help)
I've watched crews do work and re-rail cars on Class 1 railroad mainlines, this was very different. I was shocked at how fast these guys simply yanked the cars trying to get them re-railed then travel along with the car still bouncing.
I'm sure it happens more than most think. When you think of it the rails are basically balanced on the ties with the spikes acting as guides. On curves it must be especially tough to keep them straight.
Great videos, guys, thanks for posting them. Looks like the UP had a rail replacement project planned for the Permanente Sub but they didn't get to it fast enough.