Thanks for the info Chris. Sounds like this could have been really bad.
I didn't realize this was at the infamous Hermosa short cut crossing. I was wondering why the gates didn't help...no gates.
When I rode along on a speeder trip it was slow going through the many unmarked crossings from Hermosa all the way to the speeder shack right after the Animas bridge. The 550 crossing itself was even a tricky maneuver. The motor man stopped the car, unlocked the electrical cabinet, pushed the temporary button, relocked the cabinet, then ran back to make sure we cleared before the gates came back up.