Peter Mugridge
Veteran Member
It's 5 cars, so it would have been a 720 and being a single unit would have been a Cambridge service - the two class 720 diagrams on the Stansted Express are invariably 10 car workings.That’s the south end of Bishops Stortford; you‘d have been directly over Little Hallingbury at around 1500 feet, and well under a mile away from the train.
@DynamicSpirit - could you tell us the exact date and time you took the picture? It's probably possible to work out exactly which 720 it was...