40145 worked its last train in April 1983 and was withdrawn in June 1983 due to derailment damage after over 22 years of active service. It was the first locomotive of the final delivery batch that were constructed with a centrally-positioned four-character headcode box.
40145 was one of the final Class 40s to receive a general overhaul at Crewe Works in November 1980. In February 1984 the locomotive was purchased by the Class 40 Preservation Society
, the first Class 40 to enter preservation.
The locomotive became mainline certified in October 2002 and has hauled numerous railtours on the national mainline. It has recently been out of traffic for a number of years with repairs to its main generator, following a traction motor flashover.
Whilst undergoing these repairs, its owners took the opportunity to repaint it in authentic British Rail corporate blue livery and apply its pre-TOPS number of 345.
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