Stephenson's Rocket is an early steam locomotive of 0-2-2 wheel arrangement. It was built for and won the Rainhill Trials of the Liverpool and Manchester Railway (L&MR), held in October 1829 to show that improved locomotives would be more efficient than stationary steam engines.
Rocket was designed and built by Robert Stephenson in 1829, and built at the Forth Street Works of his company in Newcastle upon Tyne.
Though Rocket was not the first steam locomotive, it was the first to bring together several innovations that produced the most advanced locomotive of its day. It is the most famous example of an evolving design of locomotives by Stephenson, and became the template for most steam engines in the following 150 years.
The locomotive was displayed in the Science Museum in London until 2018, after which it was briefly exhibited at sites around the UK, ultimately at National Railway Museum in York. Between 2023 and September 2025, it was based at the Locomotion Museum in Shildon in County Durham. As of May 2026 it is now based in the National Railway Museum, York.
Rocket was built at a time of rapid development of steam engine technology. It was based on experience gained from earlier designs by George and Robert Stephenson, including the Killingworth locomotive Blücher (1814) Locomotion (1825), and Lancashire Witch (1828).
There have been differences in opinion on who should be given the credit for designing Rocket. George Stephenson had designed several locomotives before but none as advanced as Rocket. At the time that Rocket was being designed and built at the Forth Banks Works, he was living in Liverpool overseeing the building of the Liverpool and Manchester Railway. His son Robert had recently returned from a stint working in South America and resumed as managing director of Robert Stephenson and Company. He was in daily charge of designing and constructing the new locomotive. Although he was in frequent contact with his father in Liverpool and probably received advice from him, it is difficult not to give the majority of the credit for the design to Robert. A third person who may deserve a significant amount of credit is Henry Booth, the treasurer of the Liverpool and Manchester Railway. He is believed to have suggested to Robert Stephenson that a multi-tube boiler should be used.
Stephenson designed Rocket for the Rainhill trials, and the specific rules of that contest. As the first railway intended for passengers more than freight, the rules emphasised speed and would require reliability, but the weight of the locomotive was also tightly restricted. Six-wheeled locomotives were limited to six tons, four-wheeled locomotives to four and a half tons. In particular, the weight of the train expected to be hauled was to be no more than three times the actual weight of the locomotive. Stephenson realised that whatever the size of previously successful locomotives, this new contest would favour a fast, light locomotive of only moderate hauling power.
On 20 April 1829, the board of the Liverpool and Manchester Railway project passed a resolution for a competition to be held to prove their railway could be reliably operated by steam locomotives, there being advice from eminent engineers of the age that stationary engines would be required. A prize of £500 was offered as an incentive to the winner, with strict conditions a locomotive would need to meet to enter the trial. Robert Stephenson was able to report to Henry Booth on 5 September 1829 that Rocket had performed initial manufacturer tests with flying colours at Killingworth. Rocket was dismantled at Newcastle and began the long trip to Rainhill: by horse wagon to Carlisle; lighter to Port Carlisle then by the Cumberland steamer to Liverpool for re-assembly on 18 September 1829. Rocket passed the trial requirement of achieving an average speed of 10 mph (16 km/h) over 70 miles (110 km) by over 40 percent. Demonstrations also saw Rocket consistently and easily haul a carriage with over 20 persons up the Whiston Incline at over 15 mph (24 km/h), and light engine running of around 30 mph (48 km/h). No other locomotive at the trials could match anything like Rocket's performance reliably, with partners Booth and Stephensons sharing the £500 winnings and showing that stationary engines were unnecessary, with sceptics such as Rastrick being convinced.
The opening ceremony of the L&MR on 15 September 1830 was a considerable event, drawing luminaries from the government and industry, including the Prime Minister, the Duke of Wellington. The day started with a procession of eight trains setting out from Liverpool for Manchester. The parade was led by Northumbrian driven by George Stephenson, and included Phoenix driven by his son Robert, North Star driven by his brother Robert Sr. and Rocket driven by assistant engineer Joseph Locke. The day was marred by the death of William Huskisson, the Member of Parliament for Liverpool, who was struck and killed by Rocket at Parkside.
Built as a prototype to win a speed trial, the engine was soon superseded by improved designs, such as Stephenson's Northumbrian and Planet designs, both of 1830. Within a few years, the Rocket itself had been much modified to be similar to the Northumbrian class. The cylinders were altered to a near-horizontal position, compared to the angled arrangement as new; the firebox capacity was enlarged and the shape simplified; and the locomotive was given a drum smokebox. It was in this form that the engine was preserved, which were seen as so different from the original that The Engineer magazine, circa 1884, concluded that "it seems to us indisputable that the Rocket of 1829 and 1830 were totally different engines".
Its history between 1830 and 1840 is only vaguely documented. From 1830 to 1834, Rocket served on the Liverpool and Manchester Railway. After service on the L&MR, Rocket was used between 1836 and 1840 on Lord Carlisle's Railway near Brampton, in Cumberland (now Cumbria), England.
In 1834, the engine was selected for further (unsuccessful) modifications to test a newly developed rotary steam engine designed by Admiral Thomas Cochrane, The 10th Earl of Dundonald. At a cost of nearly £80, Rocket's cylinders and driving rods were removed and two of the engines were installed directly on its driving axle with a feedwater pump in between. On 22 October, of that year, an operational trial was held with disappointing results; one witness observing, that "the engine could not be made to draw a train of empty carriages". Due to inherent flaws and engineering difficulties associated with their design, Lord Dundonald's engines were simply too underpowered for the task.
In April 1837, Rocket was sold for £300 and began service on the Brampton Railway, a mineral railway in Cumberland that had recently converted to Stephenson gauge. In August that year it was used to bring back the results of an election from Midgeholme to Kirkhouse Rocket was used on mineral trains, but was too light and was laid aside in 1840. Whilst it was stored several parts were removed, including the copper plate around the firebox and the rear wheels.
Robert Stephenson wanted to take Rocket to the Great Exhibition in 1851, however James Thompson died before this could be realised. Rocket was taken to the Stephensons' yard in Newcastle until 1862 and its subsequent donation to the Patent Office Museum, London.
In 1862, Rocket was donated to the Patent Office Museum in London (now the Science Museum) by the Thompsons of Milton Hall, near Brampton.
The locomotive still exists, though it has not been operated since becoming a museum exhibit. It was displayed at the Science Museum for 150 years, although in a much modified form from its state at the Rainhill Trials. In 2018, it was displayed in Newcastle and then in Manchester at the Science and Industry Museum. Since 2019, it has been displayed at the National Railway Museum, York, except from 2023 to September 2025, when it was exhibited at the Locomotion Museum in Shildon, County Durham.