I made this video tutorial to remind myself and to teach anyone who is looking for a similar animation of working coupling rods on a steam train or tram. Easy to do once you know how. As with practically everything in Blender.
I made this video as a tribute to all those KZfaqrs who make awesome tutorials and through the years, taught me how to use and understand the amazing features of Blender. For this trick, I did however not find the tutorial I needed and had to figure it out by myself, obviously with the knowledge previously gathered.
This tutorial is made in Blender 3.2 alpha, but should work from Blender 2.8.