Introduced in 1959, ten of the class were built by Gloucester Railway Carriage and Wagon Company, each with two 230 hp British United Traction - Albion engines.

[8] The class was built specifically for parcels, fitted out with parcel racks and bike storage at each end, and did not feature any passenger accommodation.

The last members of the class were withdrawn in 1990 and broken up the following year, and none were preserved.

[6] Heljan have produced a 00 scale model in British Railways all over green, Rail Blue and Royal Mail Post Office Red liveries, although these only represent the later version with corridor connection.

[9] In 2018, Revolution Trains announced that they are to produce six different variants of the Class 128 in N gauge covering BR green, Rail Blue and RES Red liveries.