Isn’t allowed? What is preventing 156408 from being allowed to run?Actually this unit isn't allowed to run under the Northern guise until 24th May. Currently only delivered for the relevant conversion mods to take place. This unit is also one of the Northumberland Line units that will assist with the release of 158's (when it's ready).
Does this mean that only 158s will be cleared and substitutions can only be for other 158s, or will it be possible to see 156s or even 170s as on the Lime Street - Norwich which is also “only 158s”. Note that TfW runs Sprinter substitutions at 100mph timings on Manchester - Cardiff, which can’t keep time.Yes, apparently only 158s will be allowed to work the Blyth and Tyne route when it opens to passenger services due to timings.
