What must a train dispatcher do when a train is delayed for more than 20 minutes?

When a train is delayed for more than 20 minutes, it is crucial for the train dispatcher to communicate the location and duration of the delay. This action is fundamental for maintaining the safety and efficiency of train operations. By informing relevant personnel about the specifics of the delay, the dispatcher can help ensure that other trains are aware of potential conflicts or changes in their schedules.

Communication is key in the operational environment of a train dispatcher, as it allows for better coordination and response to the situation. Without this information, other trains might proceed under the assumption that the delayed train has continued on time, leading to safety risks and possible accidents. Therefore, the effective dissemination of delay information is a primary responsibility of the dispatcher to facilitate timely adjustments and maintain service reliability.