(03 Sep 2016, 10:59 am)Michael wrote I take it, X21 - Sunderland - Peterlee - then X22 Middlesbrough or X21 to Darlington?
Looks like they are just renumbering the 21 as X21 and 21A as X22 between Darlington/Middlesbrough and Peterlee.
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(03 Sep 2016, 10:59 am)Michael wrote I take it, X21 - Sunderland - Peterlee - then X22 Middlesbrough or X21 to Darlington?