The railway line between Darlington and Richmond closed in 1969. They weren’t part of the Beeching cuts, but they didn’t survive for that much beyond his cuts.
Today the branch lines round this part of the country that do survive have roughly hourly services, many of which end early in the day (In particular the line from Darlington to Bishop Auckland)
However, between Darlington and Richmond there is now a regular bus service. In fact there is a bus every 15 minutes throughout most of the day and it runs late into the evening.
It does lead you to wonder if a level of service that good could ever be provided if the branch line was reopened.
Add in the fact the buses stop in the town centre, and the station is nearly a quarter of a mile away and at the bottom of the valley near the river, and the implication is actually the current set up, whilst perhaps not as environmentally friendly, is certainly more tourist friendly.