What voltage do Transmission Wires carry along the rail corridor to substations?

What voltage do Transmission Wires carry along the rail corridor to substations?

• A. 11,000 v AC
• B. 33,000 v AC
• C. 22,000 v AC
• D. 110 v AC

Answer: (C)

Power for trains is sent along the rail corridor at a high voltage to keep the current lower and reduce losses over long distances. The transmission wires along the tracks are typically at about 22,000 volts AC. This level provides a practical balance for insulation and transformer sizing at substations, where the voltage is stepped down to the traction supply used by the railway equipment. The other values are not the standard corridor transmission level: 110 V AC is far too low for long-distance transmission, and while some systems use 11 kV or 33 kV in other parts of the network, 22 kV AC is the commonly cited transmission feed to substations in this context.

Power for trains is sent along the rail corridor at a high voltage to keep the current lower and reduce losses over long distances. The transmission wires along the tracks are typically at about 22,000 volts AC. This level provides a practical balance for insulation and transformer sizing at substations, where the voltage is stepped down to the traction supply used by the railway equipment. The other values are not the standard corridor transmission level: 110 V AC is far too low for long-distance transmission, and while some systems use 11 kV or 33 kV in other parts of the network, 22 kV AC is the commonly cited transmission feed to substations in this context.