Class 25: D5185
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Class 25: D5185
The British Rail Class 25 diesel locomotives, also known as Sulzer Type 2 were a class of 327 locomotives built between 1961 and 1967 for British Rail. They were numbered in two series, D5151-D5299 and D7500-D7677
The Class 24 locomotives were the precursor of the Class 25 design but after the delivery of their first few units it became apparent that the speed ceiling of 75 mph (121 km/h) was unduly restrictive and the provision of additional power would be advantageous. In the course of normal development the power output of the Sulzer six-cylinder engine had been increased by 90 hp (67 kW) to give a continuous traction output of 1,250 bhp (930 kW) at 750 rpm by the introduction of charge air cooling and the first locomotives to use this became known as Class 25 locomotives.
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