[Steve_Seattle]

"A derailment likely includes missing a switch track in the yard and rolling off-track for a few feet. NBD."

I agree. We need to know what constitutes a "derailing."

[kaktuskid]

Most are derailments on customer sidings, where the tracks are not in the best of shape, occurring at low speed and the car stays upright.

[the OlLine Rebel]

Getting off the rails.

It could be very minor and boring, as mentioned. Or it can be higher speed and result in quite a crash and catastrophe.

Most are probably dull roll-offs from a stub or siding.