If any pantograph fails to operate properly under Form D, what action is required?

• A. Continue at reduced speed.
• B. Stop the equipment immediately and report to the Train Dispatcher.
• C. Notify passengers to disembark.
• D. Schedule maintenance at next yard.

Answer: (B)

A pantograph fault under Form D creates an immediate safety risk in the electrical system, so the correct action is to stop the train right away and report the situation to the Train Dispatcher. Stopping immediately ensures the fault is contained, protects the overhead equipment from further damage, and allows proper coordination for power isolation and maintenance. Continuing at reduced speed could worsen damage or lead to an unsafe condition, and instructing passengers to disembark or waiting until the next yard doesn’t address the urgent safety issue. Reporting to the dispatcher is essential so qualified personnel can assess and resolve the fault before the train resumes service.