Question

Why did the development of time zones make train schedules more reliable?

Answer 1

Time zones measured time locally instead of country wide

Step-by-step explanation:

Answer 2

The development of time zones helped a lot to make the train schedules more reliable, because the time zones can create a standard time that all train can use so that they can be unified, and would make a standard that all trains can follow and not be confused by the time in their respective places.