Throttle

Throttle is a control device, typically a lever or a wheel, used to set the desired power output of a motorized rail vehicle .

Throttle control is never direct, and may go through several layers of components to be carried out, be it through governors on {{pll|Internal Combustion Engine|diesel engines}, or electric circuitry configuration on electric vehicles .

On steam engines , the equivalent of the throttle control is called regulator . It controls the amount of steam admitted from the boiler to the steam chest .

With all types of powertrains throttle needs to be applied gently, to avoid issues with wheelslip and overheating .

Application of throttle control devices is almost always made to be oriented away from the driver. This is so that, in case of emergency, you can push all the levers forward as a safety measure, without needing to think of each control individually.