Unfortunately I'm able to remember where, so i could give you a source, however sure I read that it raises the longevity of the service.

Because i be aware of it, there an inherent unreliability in the arrangement:

Picture the first sort system, and a clockwise train stopping with an unusually very long time (what about a passenger held the threshold for a friend who lost a flip flop while running for your train, or even a pigeon got stuck inside a closing door).

This small delay echoes back along the entire line, delaying every subsequent train unless you end up having every train on the line bunched near together, delaying the other. You also get a gap, just like a bubble, in front of the originally delayed train.

With a circular arrangement, this will likely remain the situation until service finishes after the morning since the bunching effect continues to echo around and around the system. Within a linear arrangement it comes with an end from the line in which the bubble can when a train terminates, and repair returns to (mostly) normal after. What's more, it limits the echo effect towards the line terminus behind the challenge, therefore it doesn keep travelling around the circle repeatedly.

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