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Unlike DP2, the 'Lion' prototype closely followed the BR design panel's specifications for the new Type 4, using industrial designers Wilkes and Ashmore, consultants for the earlier Brush D5500s, BRCW D5300s Type 2s, and diesel-hydraulic 'Hymek' classes.The BRCW Co's 2,750hp 'Lion' can be seen departing Leeds Central station with the 'up' 'Yorkshire Pullman'.The English Electric Co's candidate for the new Type 4 was DP2 - Diesel Prototype 2 - which emerged from the EE Co Vulcan Foundry in May 1962.It was essentially an enlarged version of the EE Co Type 3 Co-Co (later Class 37) the extra power being provided by the company's charged-cooled version of the 16-cylinder 16SVT engine uprated to 2,750hp.The BRCW was responsible for its design and construction, whilst AEI supplied the electrical equipment and Sulzer the 12-cylinder engine, producing a 2,750 hp Co-Co prototype - well within the BTC's specification for a 2,5000hp Type 4.
This followed criticism of the poor power/weight ratio of the earlier 1Co-Co1 Type 4s ordered under the 1955 modernisation scheme.
Following the replacement of new bogies, an improved 21 tons per axle load was eventually achieved and Kestrel was finally accepted for 100mph passenger operation on the ECML.
On October 20th 1969, the Brush/Sulzer 3,946hp 'Kestrel' hauled its first revenue-earning passenger service out of Kings Cross.
The late summer of 1962 saw the end of two chapters in the development of BR main line diesel power.
The first was the completion of the EE Co Type 4 D200s with the delivery of D399 - the last of 200 locomotives in the series - and the Type 4 Peak class was concluded at Derby and Crewe with Nos D193 and D57 being the last of the respective batches built there.
Also in 1962, 'Falcon' was used regularly on the 'Master Cutler' between Kings Cross and Sheffield, consisting of two round trips a day - 670 miles every 24 hours - albeit the lightweight Pullman of 240 to 320 tons made so little serious demand on a diesel locomotive of such power.