I know this man is a professional, and he’s only walking toward the train he’s going to drive, but that carefree smile and jaunty attitude make me nervous. I’ve internalized the MTA’s warnings about the dangers of crossing the tracks too well. The demon third rail is just waiting to throw a stone in his path so that he will trip and become a meal, for one must feed the beast.
Pix and other images 
I wonder which one is the 3rd rail?
It is the dark rail with the lighter-colored rail above it. He is actually on the “safe” side but see the original Pelham One, Two, Three and see what happens when the late Robert Shaw’s character executes himself by touching the third rail with his foot. Fried Ham! (OK, he wasn’t a ham, but the line was too good to resist!)