If a combination vehicle becomes stuck on railroad tracks, what does the AAMVA CDL Manual say to do first?

AAMVA CDL Manual, Section 6.1.4 'Railroad-highway Crossings,' p. 6-2

A vehicle stuck on tracks is in immediate danger from an oncoming train, so the first priority is getting people away from the vehicle, not trying to save the rig or the cargo. The manual's sequence, exit, move away, find emergency notification information, then call 911 with landmark and DOT number details, is a procedure drivers need to know before an emergency, not during one.