(14 Jul 2023, 12:35 pm)9920up wrote Presumably explains why Pulsars 1409, 1411, 1414,  and 1431 are all at Darlington .

1409 1411 1414 1417 are transfers in line with the return of the X66/X67 boards to Darlington from Stockton.
1431 transferred across back in March in place of the originally intended 1923 - presumably down to 1923 being non-standard within the fleet and Stockton having previously had it allocated.

Also due to land at Darlington in the next few days are E400s 7519/20 from Durham - planned for last weekend as part of the changes which has seen Darlington takeover operation of the 865 school run.