Double deckers were still used on Service 1 when the X1 was introduced.
At one point it became single / double deck operated, then it became full single deck operated in March 2013 when 7445/7446 and the two remaining Enviro 400s went to Northumberland while 7501-7504 went to Redcar/Whitby for the 93/X93 which saw 4 Redcar/Whitby Omnicitys move to Darlington.
Also in March 2013 Service 1 was cut to terminate at Bishop Auckland bus station which enabled it to interwork with service 5/5A.
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