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The British Rail Class 56 Type 5 Co-Co diesel locomotive was first introduced in 1976 to cope with the increased requirement for heavy freight. British Rail awarded the contract to design and build these new engines to Brush Traction in Loughborough, who subsequently sub-contracted the construction to Electroputere in Romania, due to the lack of capacity in their own works. The initial 30 locomotives to be delivered from Romania suffered from transit damage and construction deficiencies and had to be extensively rebuilt before entering service. With this in mind the decision was made to build the remaining 105 locomotives in England, British Rail Engineering Ltd manufacturing them at their Doncaster Works (nos. 56031 to 56115) and Crewe Works (nos. 56116 to 56135).
The design specification was based upon the Class 47 bodyshell, with the omission of redundant features such as the headcode panel. Power came from a Ruston-Paxman unit that was similar to that fitted in the Class 50 locomotives, which provided the capability for heavy haul freight. Air brakes were fitted for the first time in a British Rail engine and the electrics were improved in a number of areas, resulting in a more robust power unit. Nicknamed as Gridirons or “Grids”, the Class 56 displaced the Class 20 and Class 47 locomotives and commonly undertook the transportation of iron ore, coal, aggregate and steel across the Eastern and London Midland Regions and on the Western Region for aggregate duties.
Strong and reliable performers, the locomotives were popular, but needed heavy maintenance, particularly when compared against the Class 66 locomotives that came to displace them in service. The introduction of the Class 60 locomotives saw a gradual reduction in the use of the Class 56 locomotives and with the arrival of the Class 66 locomotives, with their greater availability and lower maintenance, the Class 56 fleet were placed into storage between 1998 and 2004. The majority of the locomotives remain in depots around the UK, despite being variously sold for scrap and then re-acquired and reinstated in service. Colas Railfreight operate a small fleet on a rotating basis and British American Railway Services and UK Rail Leasing have a number available for working. Five locomotives, 56006, 56097, 56098, 56301 and 56302 have been preserved.
56108 was built at BREL at Crewe and entered traffic on October 20, 1983 allocated to Tinsley. Having passed through British Rail, Railfreight Coal Sector and Transrail ownership, 56103 was withdrawn from service in February 2000 at Immingham with excessive wheelset wear. Subsequently identified for reinstatement, 56103 passed into Fastline service and was overhauled by Brush Traction in May 2006 and reclassified as Class 56/3. Renumbered to 56303 on May 18, 2005, the locomotive was then used alongside 56301 and 56302 on the Fastline container trains running between Doncaster, Grain, Birch Coppice and Trafford Park. With the collapse of Fastline, 56303 passed into Devon & Cornwall Railways ownership and is currently awaiting sale by tender.