I worked as an electrician for over 40 years from residential to switch yard meaning 24 V controls to 345KVA switch yards. getting shocked is
the least of your worries seen it too many times. You do know what a slice of burnt bacon looks like?
Looks like he is cranking in or removing a circuit...
Pre trip everything from slack adjusters to actual air brake test procedure, driving and backing into a dock simulated is a piece of cake.
I drove a truck crane and had fucking troopers and inspectors looking but worth it, the $$ was good.