Freightliner operated a trial 4000 tonne stone train from Tunstead to Wembley, powered by a single class 70, 70017, with 39 loaded wagons.
66620 was tucked in , dead, for insurance.
Running through the night as Network Rail wouldn't allow a day time move, the train is seen here passing slowly through Northwich , as it turns off the Mid Cheshire Line on to the single track, freight only Middlewich / Sandbach line. at 23.20.
16th March 2021
https://www.youtube.com/watch?v=M0UWuPbcLpw
AND
https://www.youtube.com/watch?v=dPj8vVrkxAA