As BR began the dieselization process, a classification system based upon engine horsepower was developed. This scale was as follows:
Type 1: 800-1000
Type 2: 1001-1499
Type 3: 1500-1999
Type 4: 2000-2999
Type 5: 3000 and greater
Early in the process, BR identified a need for locomotives of medium size and horsepower providing operational flexibility in terms of being well suited for both passenger and freight service on the mainline and branch lines. Pictured below is a selection of locomotives built with that purpose in mind.
24081 is a BR Sulzer Type 2. Possessing a six cylinder Sulzer prime mover generating 1160 horsepower, 151 of these locomotives were built at BR's Darlington, Derby and Crewe works between 1958 and 1961. Upon implementation of TOPS, they became Class 24. The class survived in regular service into the 1980s. Four 24s have been preserved. In fact, 24081 is one of the survivors.
25245 is another BR Sulzer Type 2. Considered a follow on to the Class 24, the 25 was rated at 1250 HP. 327 were constructed by BR at Darlington, Derby and Crewe along with several built by Beyer, Peacock and Company. Production started in 1961 and ended in 1967. Class 25 usage in regular service ended during the late 80s with twenty locomotives preserved.
26040 is another Sulzer equipped Type 2; however, the 26s were built by the Birmingham Railway Carriage & Wagon Company (BRCW). 47 examples of this 1160 horsepower locomotive were constructed in 1958 and 1959. Early in their careers, the locomotives were concentrated in Scotland where they served in both freight and passenger service as intended. The last 26s were removed from regular service in 1994. If you look closely at the model, you will notice what appears to be the outline of a stag's head on its side. During the Rail Blue era, a number of maintenance facilities put their "personal touches" on locomotives assigned to them. The Highland Stag was the calling card of Inverness where 26040 was assigned. Thirteen Class 26s are preserved.
33035 is a Class 33, a BRCW Type 3 rated at 1550 horsepower. 98 Class 33s were built for the Southern region between 1960 and 1962. My model of 33035 is painted in the colors of Network SouthEast, one of the passenger sectors created by BR in the 1980s. NSE was primarily responsible for the operation of passenger trains in Southern England.
The Class 26 is a Dapol model while the 24, 25 and 33 are Farish locomotives. The 24 and 25 are from new tooling introduced by Bachmann while the 33 is a former Poole model greatly enhanced by Bachmann's superior mechanism and decorative processes.
Bob