Hand Wheel

The Train Museum didn't have a tour guide the day I was there. Their rule is a simple one "go ahead and clime on the train cars. if a door is unlocked, open it and go inside." Some of the cars & locomotives were in pretty poor condition, while others they will let you drive yourself (for a fee and an appointment), but it is still massive fun. But there was no one to explain what this hand wheel is for.... a brake?

Trains
Locomotive
Engine
Cab