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The Keadby bridge has a habit of not wanting to close again after it has opened. Can’t say whether this is what happened in this case, but it wouldn’t be particularly unusual.
Unsure about route knowledge, but drivers within a possession do not have to obey signals as they would on a line open to traffic. All movements are under the instruction of the PICOP (Person In Charge Of Possesion) or the ES (Engineering Supervisor) outside and inside of worksites, respectively.
Filling up an occasional charity trackbashing tour utilising in-service units doesn’t necessarily mean that enough work could be found to keep a hypothetical similar preserved unit running on the main line. With this BLS tour there are no route clearance or route/traction knowledge issues, and...
AFAIK the converted vehicle(s) were only used on the northern leg of the Thameslink route, under the wires, so the sandite vehicle wouldn’t have been under power. As a matter of record, former class 416 (2-EPB) vehicles were used rather than MLVs. The sandite runs also seem to have not been in...