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Throttle is a control device, typically a lever or a wheel, used to set the desired power output of a motorized rail vehicle.
Throttle is a control device, typically a lever or a wheel, used to set the desired power output of a motorized {{pll|Rail Vehicle Types|rail vehicle}}.


On diesel-hydraulic and diesel-mechanical systems, it controls the fuel injection amount to the diesel engine. On diesel-electrics it sets the electrical circuits to a desired power level, which then indirectly controls fuel injection to the diesel engine to match. On electrics, the throttle also sets the electrical circuits to a desired power level, but it then takes power directly from an electrical source.
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 {{pll|Traction Motors|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 cylinders.
On {{pll|Steam Overview|steam engines}}, the equivalent of the throttle control is called {{pll|Regulator|regulator}}. It controls the amount of steam admitted from the {{pll|Boiler|boiler}} to the {{pll|Regulator|steam chest}}.


Throttle needs to be applied gently, to prevent wheelslip or overheating the drivetrain of a vehicle.
With all types of {{pll|Powertrains Overview|powertrains}} throttle needs to be applied gently, to avoid issues with {{pll|Wheelslip|wheelslip}} and {{pll|Powertrain Overheating|overheating}}.


Application of throttle is almost always made to be oriented towards the driver. This is so that, in case of emergency, the driver can push all the levers forward as a safety measure, without needing to think of each control’s individual rule.
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.


{{See also|Traction Motors|Hydraulic Transmission|Mechanical Transmission|Steam Drivetrain|Regulator|Wheelslip|Powertrain Overheating|Reverser}}
[[Category:Powertrains|4]]
[[Category:Powertrains|3]]

Revision as of 16:15, 12 March 2025

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.