What is a pantograph and its function?

• A. A device used to measure pantograph height during maintenance.
• B. A device used to switch track circuits electronically.
• C. A device that stores electrical energy for braking.
• D. A device mounted on the roof of a train that collects electrical power from the overhead catenary.

Answer: (D)

In electric rail systems, power is delivered through overhead wires. The pantograph is the roof-mounted contact device that presses a conductive element against the overhead catenary to draw current into the train’s electrical systems. It stays in reliable contact as the train moves, using a spring-loaded arm and a carbon (or similar) contact strip to reduce wear and arcing. It can adjust height and automatically retract or lower if contact is lost or to avoid damage. This is how the train collects the electrical energy needed for propulsion and onboard systems.