译：TB/T 2888-2010 Electric railways are a type of electrified railway where the power supply is provided by overhead wires. An autotransformer is used to provide additional power to the trains by increasing the voltage of the electricity from the main power supply system. The term "electrified railway autotransformer" is commonly used in English, but it may also be referred to as a traction transformer or a rail power supply transformer. "Electrified railway autotransformer" translates to "electric railways-coupling transformer"