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Building a Steam Locomotive in LEGO Part 2 – Motorization and Electronics

In my previous previous article I introduced the topic of this series – my process for building a LEGO steam locomotive, and discussed researching and choosing a prototype. In this article, I will discuss choosing motors  for a steam locomotive, options for batteries and receivers, as well as how to integrate other electronics into a LEGO train, such as lights and sound.

In past projects, after completing my research, I would typically start building up the frame of my steam locomotive. I would focus on articulation between driving wheels, pilot truck, pony truck, and tender and make sure my design could handle standard LEGO track geometry. This time, however, I wanted to build more electronics into my locomotive than just a motor, so I needed to sort out all of the electronic issues before doing any building. Still, I began with choosing a motor.

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