40106 worked its last train in March 1983 and was withdrawn in April 1983 due to it being surplus to requirements after over 23 years of active service. It was one of 20 Class 40s built at the Robert Stephenson & Hawthorn factory in Darlington, making way for capacity at the English Electric Vulcan Foundry to build the 22 production Class 55 Deltics.
By 1978 the locomotive was among a handful of Class 40s which still had not been repainted into BR corporate blue livery. During its last works overhaul at Crewe in September 1978, the locomotive was repainted in its original green livery with full yellow ends. Being unique in this respect at the time 40106 took part in the Rocket 150
celebrations at Rainhill during 1980. It was also regularly used on railtours until being retired from regular service.
After its withdrawal, 40106 was purchased by a private individual and moved to the Great Central Railway
. Whilst here it was given its original number of D306 and named Atlantic Conveyor
in memory of the cargo ship and those who lost their lives in the Falklands War.
In 1990 the locomotive left the Great Central Railway and was moved to the Nene Valley Railway
. In 2011 it had a complete bodywork restoration and is now based at the former Alstom facility at Washwood Heath, Birmingham.
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