We just learned about the Valve Gear.
Another part of a steam locomotive is the Johnson Bar, also called the reach rod or reversing lever.
This is a lever that is hooked up to the Valve Gear, and is up in the Cab so that the engineer can push or pull on it to control the speed.
No one really knows why it has the name of Johnson Bar!
(from: wikipedia - johnson bar (locomotive))
Kid Facts - Blast from the past: Axle
