Yes GG-1, some emergency personal do dumb things some times. You have to consider a firefighter running into a burning building when all the sane ones are running out. Trust me, I do it as a volunteer, and while we (and our career counterparts) work hard to stay alert and safe, things do happen. BTW, count me among those who always wear a seat belt riding in a car or firetruck.
Looks like these guys figured out they were doing a stupid thing and tried to correct it, only one person on the rig and was trying to move it off the tracks.
Its happened before. Two firefighters were killed in September 1989 near Catlett, Virginia by an Amtrak train, One was killed in March 2000 near Fayetteville NC. Both accidents were unavoidable by Amtrak.
For a firefighter perspective check www.firefighterclosecalls.com