How are subway trains powered?
A few early subways used steam engines, but in most existing subways, the trains, tunnel lights and station equipment all run on electricity. Overhead wires or an electrified rail known as the third rail supplies power to the trains.
Yes, all the diesel engines actually run on electric motors , they just have a diesel engine to run the alternator. Even diesel locomotives are actually diesel electric generators that power the traction motors. Since it is eventually electricity that powers the wheels, trains run on electricity.
- This allows for a simpler drive train. The Torque of the diesel engine will twist the drive shaft like a rubber band and the clutch and transmission will surely be failed. So modern locomotives use diesel engine with an electric generator as an electric power plant which drives electric motors.
- Railway electrification using 25 kV, 50 Hz AC has become an international standard. There are two main standards that define the voltages of the system: EN 50163:2004+A1:2007 - "Railway applications. Supply voltages of traction systems"
- Diesel–electric transmission is used on railways by diesel electric locomotives and diesel electric multiple units, as electric motors are able to supply full torque at 0 RPM. Diesel–electric systems are also used in submarines and surface ships and some land vehicles.
With diesel-electric and electric locomotives, the gear ratio between the traction motors and axles is what adapts the unit to freight or passenger service, although a passenger unit may include other features, such as head-end power (also referred to as hotel power or electric train supply) or a steam generator.
- The rivers provided the power for the factories. Once the steam engine was invented, factories could locate anywhere. They no longer had to be near rivers. A second impact of the steam engine on the Industrial Revolution was the impact it had on transportation.
- The FRA says an increase is partly a result of more trains being consolidated on fewer main lines. Regulations vary from state to state, with most states allowing no longer than 20 minutes for a train to block a crossing, said Warren Flatau, a Federal Railroad Administration spokesman.
- George Stephenson
Updated: 14th October 2018