Final answer:
Timetables should be made up so that both local and express trains arrive at a station simultaneously during rush hour to facilitate passenger transfers.
Step-by-step explanation:
The most important time for timetables to be made up so that both local and express trains arrive at a station simultaneously is during rush hour. At this time, there are typically more passengers who need to transfer between trains.
By coordinating the arrival of both local and express trains, passengers are given an opportunity to change trains without having to wait for a significant amount of time. This helps to ensure a smoother and more efficient transit experience for commuters.