A train drives under an train signal over pass. Camera changes to a shot above the train, showing the electrical lines which power the locomotive. A older man steps into an elevator, and the door closes behind him showing it’s decorative door. CU on the elevator floor dial as the elevator goes up. CU on a hand pushing a rotary saw through a sheet of wood. A magnet is set up on a stand, and a hand waves another magnet near it. The hand switches the polarity causes the other magnet on the stand to spin. Next the hand sets up a nail wrapped with copper wire, and attaches the wire to a battery to create an electromagnet. By switching the connections to opposite poles the magnet spins like it did in the scene before.