What is one consequence of a train operator running ahead of schedule?

When a train operator runs ahead of schedule, it primarily creates operational challenges for the entire rail network. One of the significant consequences is traffic delays for other trains. When a train is ahead of schedule, it can disrupt the carefully planned timetable, leading to other trains needing to wait or alter their schedules to maintain safe distances and avoid collisions. This can result in a cascade of delays throughout the system, as one train's early arrival can impact multiple subsequent operations.

In contrast, options like increased fuel consumption or overloading the following train may not directly stem from the train being early. Overloading typically refers to passenger or cargo limits being exceeded, which are separate issues from timing. Similarly, while a reduction in service efficiency can be a long-term effect, the immediate and direct consequence of one train running ahead of schedule is more accurately linked to traffic delays for other trains, which reflects the interconnected nature of rail operations.