Passenger
British Railways introduced the Mark 1 carriage in 1951. The design incorporated the best features from the passenger vehicles of the pre-nationalisation companies. The coach was to be the standard for all new construction, and was to be used on every region. The interior was fitted-out for all Classes of accommodation in both open and corridor variants.
The original bogie design was a double bolster type, but excessive tyre wear and unsatisfactory ride quality lead to the introduction in 1958 of the Commonwealth bogie. However, whist a very sucessful design, this cast steel bogie was of heavy construction, and Swindon designed and introduced the B4 as a light weight replacement. The B4 proved to be a success in all respects and was retrofitted to many earlier Mk 1 coaches.
The XP64 set of coaches were Mk 1's with improved features which were subsequently incorporated into the Mk 2 design.
The Mark 2 passenger carriage was introduced in 1964 as a development in construction methods, and to overcome corrosion problems with the Mk 1. The design was also stronger in the event of a collision or accident. The B4 bogie was used on the Mk 2 carriage.
British Railways introduced the Mark 1 carriage in 1951. The design incorporated the best features from the passenger vehicles of the pre-nationalisation companies. The coach was to be the standard for all new construction, and was to be used on every region. The interior was fitted-out for all Classes of accommodation in both open and corridor variants.
The original bogie design was a double bolster type, but excessive tyre wear and unsatisfactory ride quality lead to the introduction in 1958 of the Commonwealth bogie. However, whist a very sucessful design, this cast steel bogie was of heavy construction, and Swindon designed and introduced the B4 as a light weight replacement. The B4 proved to be a success in all respects and was retrofitted to many earlier Mk 1 coaches.
The XP64 set of coaches were Mk 1's with improved features which were subsequently incorporated into the Mk 2 design.
The Mark 2 passenger carriage was introduced in 1964 as a development in construction methods, and to overcome corrosion problems with the Mk 1. The design was also stronger in the event of a collision or accident. The B4 bogie was used on the Mk 2 carriage.