If a train is allowed to run early at Jamaica, what must it have besides signal indication?

When a train is permitted to run early at Jamaica, it must obtain permission from the station master in addition to having a signal indication. This requirement ensures that the train's early departure is coordinated with the operations at the station, allowing for safe scheduling and the management of train traffic. The station master is responsible for overall safety and operational integrity at the station, and their permission is crucial to avoid potential conflicts with other trains or operations in the area.

While having a communication device could aid in the coordination process, and a clear track ahead is important for the safe movement of trains, these factors do not replace the necessity of obtaining explicit permission from the station master when running early. A set timetable, while relevant to scheduling, does not grant authority for an early departure without that critical permission. Thus, maintaining clear communication and authority through the station master's approval is essential for safe and efficient train operations.