What is a service disruption?

• A. An event that interrupts normal service, such as delays, cancellations, or track work
• B. A routine maintenance movement
• C. The time a train remains at a station
• D. The official timetable

Answer: (A)

A service disruption means an event that interrupts normal service. It covers things like delays, cancellations, or track work that changes how trains run, reducing the usual reliability or accessibility of service.

Think of it as anything that stops trains from following the normal schedule as planned. Routine maintenance is planned work that keeps the system healthy, so it isn’t considered a disruption. The time a train stays at a station is just dwell time, not an interruption to the overall service pattern. The official timetable is the planned schedule for normal operations, not an interruption.

So the best choice captures the idea of an interruption to the usual service, whether temporary delays, cancellations, or work on the tracks.