All trains on the East Coast Main Line have been stopped because of a "huge number" of trespassers trying to see the iconic Flying Scotsman train on its journey from London to York.
The Flying Scotsman itself was also stopped as Network Rail warned people not to trespass on the railway to try and get a better view.
The train arrived at King's Cross station in London today for its inaugural journey after a decade-long £4.2 million refit.
Thousands of rail fans were expected to line the tracks and bridges along the route as the famous locomotive, built in 1923, travels up the line.
Network Rail said it had to stop all trains due to trespassers, warning that it was "hugely dangerous" to step onto the tracks. It has now restarted trains "at slow speed".
The train has been restored for 10 years and returned to its original 'British Rail green'.
Named after the train service between London and Edinburgh, The Flying Scotsman was the first to travel the journey at 100 miles per hour.
Once in York it will go on display at the National Railway Museum until 6 March before setting off on a tour around the country.
The museum's head curator Andrew McLean said that seeing the train "looking exactly as she should, in steam and alive again" would be a "really special moment for many people".
Flying Scotsman inaugeral journey
(01 of18)
Open Image ModalPrimer is applied ready for the the Flying Scotsman's green livery. (credit:Christopher Furlong via Getty Images)
(02 of18)
Open Image ModalUndergoing restoration work in the National Railway Museum in York. (credit:OLI SCARFF via Getty Images)
(03 of18)
Open Image ModalMichael O'Conner, a works foreman for Heritage Painting, paints the number 60103 on the cab if of the train at the National Railway Museum in York. (credit:OLI SCARFF via Getty Images)
(04 of18)
Open Image ModalThe number when nearly complete. (credit:OLI SCARFF via Getty Images)
(05 of18)
Open Image ModalThe finishing touches are applied. (credit:Christopher Furlong via Getty Images)
(06 of18)
Open Image ModalA workmen prepares to place the name plate on. (credit:Owen Humphreys/PA Wire)
(07 of18)
Open Image ModalA sign being placed on the iconic steam locomotive as it stands by the platform at Bolton Street Station in Bury near Manchester. (credit:ASSOCIATED PRESS)
(08 of18)
Open Image ModalThe Flying Scotsman hauls the Winter Cumbrian Mountain Express through Ribblehead in Kendal, England. (credit:Christopher Furlong via Getty Images)
(09 of18)
Open Image ModalTravelling over the Ribblehead Viaduct in Kendal. (credit:Christopher Furlong via Getty Images)
(10 of18)
Open Image ModalPulling carriages during a test run along the East Lancashire line for the first time in ten years. (credit:Nigel Roddis via Getty Images)
(11 of18)
Open Image ModalAn engineer sits inside the engine during the test run. (credit:Nigel Roddis via Getty Images)
(12 of18)
Open Image ModalCrossing a viaduct during a test run along the East Lancashire line. (credit:Nigel Roddis via Getty Images)
(13 of18)
Open Image ModalEngineers chat on the back up tender. (credit:Nigel Roddis via Getty Images)
(14 of18)
Open Image ModalThe Flying Scotsman pulls carriages. (credit:Nigel Roddis via Getty Images)
(15 of18)
Open Image ModalSpectators take pictures at Bolton Street Station. (credit:ASSOCIATED PRESS)
(16 of18)
Open Image ModalPainted in its traditional colours, it passes through Peterborough railway station. (credit:Chris Radburn/PA Wire)
(17 of18)
Open Image ModalPassing through York for a run to Scarborough. (credit:Owen Humphreys/PA Wire)
(18 of18)
Open Image ModalMembers of the public watch as the Flying Scotsman leaves Kings Cross station, London, on its inaugural run from the capital to York. (credit:Jonathan Brady/PA Wire)