This is a very simple Diesel Switcher Locomotive for O Gauge using a Märklin Clockwork motor and parts. I had till now never used the Märklin clockwork motor, so I wanted to make something very simple and using a minimal number of parts. The first 35 seconds shows the locomotive running at normal speed with which it takes about three rounds of the track. The Märklin clockwork motor is two speed and the later portion shows the locomotive running at slower speed.