The town of Morpeth in Northumberland, England, has what is reputed to be the tightest curve (17 chains or 340 metres radius) of any main railway line in Britain.
The track turns approximately 98° from a northwesterly to an easterly direction immediately west of Morpeth Station on an otherwise fast section of the East Coast Main Line railway.
The driver had apparently allowed his attention to wander because he was thinking about an official letter that he had been handed when booking on duty, asking for an explanation of time lost on a previous journey.
The driver involved in this accident, Peter Allan,[7] was prosecuted for being under the influence of alcohol, but acquitted after what was described by the Expert Witness Institute as an ambush defence.
[9] Mr Allan had consumed alcohol both before and after booking on duty, but the defence countered that he suffered from bronchitis and had in the past experienced severe coughing fits that had caused him to fall unconscious.
The accident occurred during engineering work and was the result of the locomotive driver and the signaller at Morpeth failing to come to a clear understanding concerning required movements.