Urban buses are automatics for mainly financial reasons.
No clutch to wear out and have to replace
Less wear and tear on the drivers left leg. Can you imagine how many gear changes would be made on an 8 hour shift on an urban bus route?
Autos cant be abused/thrashed by novice drivers.
We had some Mercedes 709D minibuses many years ago that were going through clutches on average once every four months. Each vehicle was converted to auto at a cost of around £3000, which was recouped in less than two years on the cost savings of clutches, off road time, etc.
Cant say much about coaches, but as far as I know a manual gearbox will achieve slightly better fuel economy on a run, and most coaches spend a large part of their life on motorways with far less stop start driving that is bus service work.
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