The Lincoln rail crash occurred on 3 June 1962, when the 22:15 sleeping car express train from King's Cross to Edinburgh derailed on a sharp curve just a short distance east of Lincoln Central railway station.
Two passengers and a sleeping car attendant were killed and seven people were seriously injured.
The train had been diverted from its usual route because of engineering work on the East Coast Main Line.
The conductor driver was not qualified to drive diesel locomotives, but he had done so occasionally before.
Most of the coaches were derailed although the locomotive was not; the latter coming to a stand in the middle of Lincoln Central station.