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Yup, 5R06 Grove Park to Ashford is bringing in a 376 for traction training courses for the 375/465 drivers based at Ashford depot as 376s will be running out of Ashford soon..
YE43 at the end of Dover Priory P3 is locked at a red aspect.
It can physically display a single yellow for a shunt release but shunt moves are forbidden in Dover Harbour Tunnel which is why it's locked at red.
It would be limited by weight of the train - as the consist would have to transverse gradients etc
Plus there's platforms lengths and signals to consider as well