My current train is powered by two steam locomotives, which helps pull heavily laden troop trains over steep mountain passes. This design for the drive wheels proved disasterous when I added switches to the layout, but that has since been corrected. The piston arms make a train-like clattering sound as the wheels drive the piston arms in and out of the cylinders. Both of my locomotives are designed to carry electric lights, which will be fitted as soon as my connection cables arrive.