The steam era on British Rail officially ended almost forty years ago in August 1968 when a Britannia Class engine named “Oliver Cromwell” hauled a train from Liverpool Lime Street to Carlisle. The story is told here:
A new exhibition about the end of steam hauled trains opens at the National Railway Museum in York on May 24 called 1968 and all that. It’s only there for the half term holiday until 1st June. Entrance to the museum if free but it’ll cost you £11 for the exhibition.