Why are timetables designed so that both local and express trains arrive at the same time?

Timetables are designed to facilitate convenient transfers between local and express trains, which is why they are often synchronized to arrive at the same time. This coordination enables passengers who need to change from one service to another to do so without having to wait an extended period. It creates a seamless travel experience, allowing for quicker connections and enhancing overall efficiency in the transit system. Passengers can save time and reduce the frustration of missed connections, making public transportation a more attractive option. The overarching goal is to improve accessibility and convenience for travelers.

Other factors like reducing train congestion or optimizing track use are also important in timetable design but are secondary to enhancing passenger connectivity through timely transfers.