- The project reached the prototype stage, with the introduction of three Class 91.
- The line was frequented with classes 91.
- The influence is strongest with the Class 91 locos which took many features from the APT powercars.
- Diesel-electric locomotives were classed from Class 31 up, diesel-hydraulic locomotives as Class 91.
- Class 90s to cover for Class 91s; one was repainted in GNER livery but not dedicated to the franchise.
- Various classes of multiple units have been used, including NSB Class 86, NSB Class 87 and NSB Class 91.
- Passenger use continued on the ECML until 5 March 1989, a week before the Class 91s entered service on the diagrams.
- Two Class 91 units have been preserved by the Norwegian Railway Club, one on the Kr鴇eren Line and one at Marienborg.
- The Class 91s began passenger service on 3 March 1989 when 91001 worked 1P26 17.36 London Kings Cross to Peterborough train.
- Similar BR Class 91 Driving Van Trailer ( DVT ) used on the ECML differ by being fully equipped for high-speed train control.