1. Intro

The "Wild Wild West" Karakuri model takes rotary motion input and makes a train move in circles around a track. The mechanism has two gears with a gear ratio of 0.5, since one has 6 teeth and the other 12 (as shown below) . 

I decided to make the output motion of the train more interesting by combining the "Wild Wild West" mechanism with a linkage mechanism.  The goal was to be able to provide a constant velocity input and observe a varying velocity output of the train.