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werther57 t1_its6esz wrote

It takes a Braintree train about 110 minutes to do a full loop. An Ashmont train could do it in 95 but to stay intermixed they also take 110 minutes. 17 red line trains show up on the tracker right now. That means that at best there is one train every 6.5 minutes.

The reason it often takes longer is because the trains are not spaced out evenly. All the MBTA has to do is keep trains 6.5 minutes apart which requires more synchronization between trains than just running each individual train as fast as possible only held back by the train in front. It's implemented in other major cities with a functioning metro system.

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