Problem with coaches on the X9/X10 are: they would be a much more expensive to buy and run than buses and how many years would you expect to use them on the X9/X10 for? Then there is the question what would you do with them when it's time to replace them, can't really displace them onto another service and who would want buy coaches with such high mileage? Also, coaches have not proven popular with the elderly and disabled in the area previously on the likes of the Arriva X66.
Go North East seem to be a similar thing with the X9/X10 as Lothian Buses with their Airlink 100 service which is buy buses for the service and then replace them a few years down the line onto a less demanding service(s).
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