Colchester: Network Rail Class 73 73951 passes on driver training (for Colas Rail test trains?)

Rumoured to be soon taking over Class 37's on Colas operated NR test train's in the area? The first time in 40 years I have personally seen a 73 on power at Colchester, although they have been through on other occasions. Filmed 18/4/22.

[@jameo20]

Guessing it’ll be 73’s top and tail as I don’t think they’re compatible with DBSO’s

[@SansPareil]

You may well be correct there.