The Flying Scotsman is marking the reopening of the landslip-hit Settle-to-Carlisle rail line.
The stretch at Eden Brows, between Carlisle and Armathwaite had to be shut in February 2016 after 500,000 tones of earth moved.
Network Rail has underpinned the line by driving hundreds of concrete-filled steel piles into the bedrock as part of a £23m scheme.
The famous locomotive is travelling from Keighley to Carlisle.
Latest updates as passengers welcome Flying Scotsman
Network Rail said the repair project had been the most challenging it had undertaken in its 15-year history.
The route provides a lifeline to thousands of small businesses and is also a magnet for rail enthusiasts.
Martin Frobisher, from Network Rail, had said he would be “punching the air” when the first Northern train service left Carlisle.
It departed at about 05:50 BST.
The Scotsman, which has been hired for the day by the Keighley & Worth Valley Railway, is making a one-off chartered trip from Keighley.
Passing through Settle, Appleby and Armathwaite, it is due to arrive at Carlisle at 13:05.
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