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What is the difference between Peak Classes 44, 45 and 46 locomotives?
British locomotive classes 44, 45 and 46 were an early design of diesel-electric locomotive intended for mainline passenger duties. They were built between 1959 and 1963 and collectively became known as 'Peaks' thanks to early locomotives being named after British mountains.
Externally, the three classes of locomotive appear almost identical, the only reason three classes were introduced was to distinguish between slight design differences to their prime movers and generators.
The first to be introduced was the Class 44 using a Sulzer diesel engine and a Crompton Parkinson generator that produced 2300hp. The Class 45s only addition was an intercooler which boosted its power output to 2500hp and finally, the Class 46 appeared using the same diesel engine and intercooler as the 45 but with a Brush generator and also produced 2500hp.
There were 193 Peak locomotives made, the majority of which were Class 45s. They were considered to be a successful class of locomotive providing motive power for Midland Mainline, Cross-Country and Trans-Pennine services meaning they were no stranger to many parts of the country.
The Class 45s (being the most numerous) were considered to be the standard Peak locomotive and therefore enjoyed the longest lifespan with the last example being withdrawn in 1989.
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