Most trains are “two-headed” with a locomotive on either end. The driver switches sides at the end/depot station, effectively reversing the train without turning around.
When train reaches the end it goes onto a special “parking” dead end track that’s connected to both directions. Driver moves to the other locomotive and transfers the train to a reverse track.
As for time intervals – it’s just a lot of trains and a strict schedule. If some emergency happens, the entire line halts for a while.
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