Amtrak catenary system voltages and frequencies are which of the following?

• A. 12 kV-25 Hz
• B. 12.5 kV-60 Hz
• C. 25 kV-60 Hz
• D. 50 kV-50 Hz

Answer: (C)

Amtrak’s overhead electric supply is designed to deliver substantial power efficiently and with common North American electrical equipment. The standard is 25,000 volts (25 kV) AC at 60 hertz. Using a higher voltage reduces the current needed for the same power, which lowers conductor losses and minimizes the size and number of substations required. The 60 Hz frequency matches the North American grid, making equipment like transformers, motors, and control systems widely compatible and readily available. The other options don’t fit Amtrak practice: lower voltages would require heavier, more costly wiring and more substations, and frequencies outside 60 Hz are not the North American traction standard.