In this video an elevator enthusiast discovers an unlocked machinery room for an pair of elevators. He sneaks in and gives a tour. First he goes over the motors and controllers, then he sticks his camera down a view port to give a view of the shaft.
Odd what one notices -- I noticed that, unlike adventure movies, there wasn't a ladder mounted in the wall that the hero could climb to get out of a tight spot. Alas, another movie trope shot to pieces.