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.
History
Prior developments
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).
Conception
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.
Rainhill trials
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 over by over 40 percent. Demonstrations also saw Rocket consistently and easily haul a carriage with over 20 persons up the Whiston Incline at over , and light engine running of around . No other locomotive at the trials could match anything like Rockets 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.
Operation
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.Bailey; Glithero (2000: 35–37) At a cost of nearly £80, Rockets 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.
Preservation
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.
One rocket replica is used at Locomotion Shildon for train rides while an identical one has cutaway sections and is on display at York NRM
Design
The locomotive had a smokestack chimney at the front, a cylindrical boiler in the middle, and a separate firebox at the rear. The large front pair of wooden wheels was driven by two external cylinders set at an angle of 38°. The smaller rear wheels were not coupled to the driving wheels, giving an 0-2-2 wheel arrangement. One of the cylinders drove a small diameter feedwater pump which pumped water from the tender to the boiler; a valve could be adjusted to control the amount of water needed.
Driving wheels
Stephenson's most visible choice was to use a single pair of driving wheels, with a small carrying axle behind. This was the first 0-2-2 and first single driver locomotive. The use of single drivers gave several advantages. The weight of coupling rods was avoided and the second axle could be smaller and lightweight, as it only carried a small portion of the weight. Rocket placed just over tons of its ton total weight onto its driving wheels, a higher axle load than Sans Pareil, even though the 0-4-0 was heavier overall at 5 ton, and officially disqualified by being over the ton limit. Early locomotive designers had been concerned that the adhesion of a locomotive's driving wheels would be inadequate, but Stephenson's past experience convinced him that this would not be a problem, particularly with the light trains of the trials contest.
Boiler Rocket uses a multi-tubular boiler design. Previous locomotive boilers consisted of a single pipe surrounded by water (though the Lancashire Witch did have twin flues). Rocket had 25 copper fire-tubes that carried the hot exhaust gas from the firebox, through the wet boiler to the blast pipe and chimney. This arrangement resulted in a greatly increased surface contact area of hot pipe with boiler water when compared to a single large flue. Additionally, radiant heating from the enlarged separate firebox helped deliver a further increase in steaming and hence boiler efficiency.
The original innovator of multiple fire-tubes is unclear, between Stephenson and Marc Seguin. It is known that Seguin visited Stephenson to observe Locomotion and that he also built two multi-tubular locomotives of his own design for the Saint-Étienne–Lyon railway before Rocket. Rockets boiler was of the more highly developed form, with the separate firebox and a blastpipe for draught, rather than Seguin's cumbersome fans, but Rocket was not the first multi-tubular boiler, although it remains unclear just whose invention it was.
The benefits of increasing the fire-tube area had also been attempted with Ericsson and Braithwaite's Novelty at Rainhill. Their design though used a single fire-tube, folded in three. This offered an increased surface area, but only at the cost of a proportionately increased length and so poor draught on the fire. Its arrangement also made tube cleaning impractical.
The advantages of the multiple-tube boiler were quickly recognised, even for heavy, slow freight locomotives. By 1830, Stephenson's past employee Timothy Hackworth had re-designed his return-flued Royal George as the return-tubed Wilberforce class.
Blastpipe
Rocket also used a blastpipe, feeding the exhaust steam from the cylinders into the base of the chimney so as to induce a partial vacuum and pull air through the fire. Credit for the invention of the blastpipe is disputed, though Stephenson used it as early as 1814. The blastpipe worked well on the multi-tube boiler of Rocket but on earlier designs with a single flue through the boiler it had created so much suction that it tended to rip the top off the fire and throw burning cinders out of the chimney, vastly increasing the fuel consumption.