Which Pantograph must be up on single or coupled Electric Locomotives under normal operation?

• A. Trailing Pantograph up on each unit.
• B. Leading Pantograph up on each unit.
• C. Both Pantographs up.
• D. None.

Answer: (A)

In electric locomotives, the single pantograph that stays raised under normal operation is the trailing one on each unit. This arrangement provides a stable and reliable current pickup path as the train moves, and it helps avoid interference between units in a multiple-unit consist. If the leading pantograph were raised as well, there’s a greater chance of pantograph-to-pantograph contact, arcing, or mechanical interference, especially on curves and with adjacent units. Keeping only the trailing pantograph up simplifies the electrical and mechanical setup, reduces wear and potential damage to the overhead catenary, and ensures power can be drawn consistently from the wire behind the locomotive.