What is a pantograph in the context of overhead electrical systems?

What is a pantograph in the context of overhead electrical systems?

• A. A device used to visualize the overhead lines
• B. A device that records train speeds
• C. A device that collects current from the overhead contact wire
• D. A device that powers the signals on the rail

Answer: (C)

In overhead electric rail systems, the device on the train that serves as the current collector is the pantograph. It sits on top of the locomotive or car and uses a spring-loaded structure to push a contact strip against the overhead contact wire. As the train moves, the pantograph maintains a steady contact, allowing electrical power to flow from the wire into the train’s traction system and onboard equipment. This enables propulsion and operation of electrical systems without needing alternative power sources. Other descriptions don’t fit the pantograph: one would be for visualizing or inspecting the lines, another for recording train speed, or another for powering track signals. The pantograph’s sole role is to draw current from the overhead wire to power the train.

In overhead electric rail systems, the device on the train that serves as the current collector is the pantograph. It sits on top of the locomotive or car and uses a spring-loaded structure to push a contact strip against the overhead contact wire. As the train moves, the pantograph maintains a steady contact, allowing electrical power to flow from the wire into the train’s traction system and onboard equipment. This enables propulsion and operation of electrical systems without needing alternative power sources.

Other descriptions don’t fit the pantograph: one would be for visualizing or inspecting the lines, another for recording train speed, or another for powering track signals. The pantograph’s sole role is to draw current from the overhead wire to power the train.