This can include any active passenger, freight or ECS workings. Basically how many services are there where the train overtakes another running service, only to then be overtaken later on during the journey, or vice versa. Bonus points if the overtaken train is the same one that overtakes it later or earlier.
I would hazard a guess that the Waterloo - Poole stopper (pre-Covid) meets this criteria since it would overtake several suburban services on its way out of London, only to then make lengthy stops to allow fast Weymouths to overtake.
I would hazard a guess that the Waterloo - Poole stopper (pre-Covid) meets this criteria since it would overtake several suburban services on its way out of London, only to then make lengthy stops to allow fast Weymouths to overtake.
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