A steam train slipped off the rails near Whitby station on Tuesday, sparking an investigation into the cause.
A set of wheels on the locomotive Eric Treacy fell off the tracks as it was moving into a siding beneath the New Bridge.
North Yorkshire Moors Railway general manager Philip Benham said there was no danger to the engine crew or passengers as the train was travelling at a very low speed.
He added: “Any incident is serious, of course, but there was no risk to people and there were no passengers involved.”
The points at the siding are manually operated and so the ensuing investigation will ask whether there was human error on the part of the NYMR train’s volunteer crew.
Mr Benham added: “Whenever there’s a derailment you need to find out why, so we shall need to investigate with Network Rail. It’s their siding, but it’s our engine.”
The 72 ton locomotive was jacked back into place during Wednesday night by the NYMR rerailing team.
A survey was then undertaken to discover if the track had a fault, or what damage may have been caused.
Passengers who had hoped to travel from Whitby on the 2pm train were provided with a bus replacement service.