Staff at the National Railway Museum in York fitted new wheels to No 4472, the Flying Scotsman, at their workshop, while chief mechanical engineer Rod Lytton described the intricacies involved in a wheel refit to excited guests.

Workers at the NRM used a device known as a 'wheel drop' which dates from the days of steam, and has been maintained in full working order.

This device allows the locomotive to stay on the rails while a short section of track is lowered and raised so individual axles can be fitted in turn.

Said Rod: "We are very fortunate to have a 'wheel drop' as, without it, refitting the wheels of Flying Scotsman would have been very difficult, requiring the use of a mobile crane.

"Refitting the wheels brings us one step closer to putting this magnificent steam giant back on the mainline – something we are all very excited about."

Flying Scotsman, built at the Plant Works in 1923, is the world's most famous locomotive and considered a national treasure.

The A3 class loco secured its place in history in 1934 when it became the first steam locomotive to reach 100mph in an authenticated trial.

Andrew Scott, Director of the NRM, said: "Over £1million has been raised by the public to restore this beloved locomotive to full working order – demonstrating its indisputable position as a railway icon amongst the people of the UK.

"Seeing another major step forward in its restoration is a very exciting moment, not only for NRM but for the nation as a whole."

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