Let’s say we got a Line A,B,C,D. Each station is 10 km apart, where the train needs 5 mins for each part.
Now, with a circular setup the train drives A-B-C-D- and has a frequency of 20 minutes. Also you set up a second anti-clockwise circle. That’s 2 trains running with each 20 minutes freq.
I setup the same Line but straight. Goes A-B-C-D-C-B-. My frequency is 30 minutes, when I add a second train its 15 minutes.
Just take a second to think about it: Do you know any real life circual bus or train routes?
