If a train is routed from express to local track, will additional running time be added?

The correct choice reflects the operational practices of train scheduling and the management of running times. When a train is routed from an express track to a local track, it typically does not result in automatic adjustments to the scheduled arrival time. This is because the timetable is designed with certain assumptions about train operations; running times are predetermined based on the route and stops involved.

While it's true that local tracks often necessitate additional stops, and those stops inherently might add time to the journey, such adjustments to the arrival schedule are not routinely incorporated solely based on the change in track type. Instead, the focus usually remains on the overall journey time as dictated by the schedule, unless specific delays or circumstances arise that necessitate a revision.

In practical terms, this means that unless a train is making extra stops as a result of changing from express to local service, its scheduled arrival time typically remains unchanged. Thus, the answer accurately reflects the standard operating procedure in train scheduling and routing.