"... but any lineman worth his salt is going to take appropriate steps to safegaurd against such stray currents anyways, or they ought not be doing that sort of work."

Linemen can be just as stupid and careless as plumbers, septic tank cleaners, veterinarians and soldiers.

I was recently driving a RR crew member who used to be a lineman, and he was telling us all the different ways that they get killed. Some were true accidents, some were from stupidity.

Don't assume.