Had a similar occurrence a few months ago. Initially blamed on someone pulling the emergency chord leading to a late departure from St Pancras while the system was reset. Only for the brakes to be reapplied at Elstree and another reset. Only to occur again and limp into Luton Airport Parkway where the service was terminated.
In other news, today's 0539 Corby service is cancelled due to a fault with the traction equipment.
In other news, today's 0539 Corby service is cancelled due to a fault with the traction equipment.