ⓘ Traction engine
A traction engine is a self-propelled steam engine used to move heavy loads on roads, plough ground or to provide power at a chosen location. The name derives from the Latin tractus, meaning drawn, since the prime function of any traction engine is to draw a load behind it. They are sometimes called road locomotives to distinguish them from railway locomotives – that is, steam engines that run on rails.
Traction engines tend to be large, robust and powerful, but heavy, slow, and difficult to manoeuvre. Nevertheless, they revolutionized agriculture and road haulage at a time when the only alternative prime mover was the draught horse.
They became popular in industrialised countries from around 1850, when the first self-propelled portable steam engines for agricultural use were developed. Production continued well into the early part of the 20th century, when competition from internal combustion engine-powered tractors saw them fall out of favour, although some continued in commercial use in the United Kingdom well into the 1950s and later. All types of traction engines have now been superseded in commercial use. However, several thousand examples have been preserved worldwide, many in working order. Steam fairs are held throughout the year in the United Kingdom, and in other countries, where visitors can experience working traction engines at close hand.
Traction engines were cumbersome and ill-suited to crossing soft or heavy ground, so their agricultural use was usually either "on the belt" – powering farm machinery by means of a continuous leather belt driven by the flywheel – or in pairs, dragging an implement on a cable from one side of a field to another. However, where soil conditions permitted, direct hauling of implements "off the drawbar" was preferred – in America, this led to the divergent development of the steam tractor.
Limits of technical knowledge and manufacturing technology meant that practicable road vehicles, powered by steam, did not start to appear until the early years of the 19th century.
The traction engine, in the form recognisable today, was developed from an experiment in 1859 when Thomas Aveling modified a Clayton & Shuttleworth portable engine, which had to be hauled from job to job by horses, into a self-propelled one. This alteration was made by fitting a long driving chain between the crankshaft and the rear axle. Thomas Aveling is regarded as "the father of the traction engine". Other influences were existing vehicles which were the first to be referred to as traction engines such as the Boydell engines manufactured by various companies and those developed for road haulage by Bray. The first half of the 1860s was a period of great experimentation but by the end of the decade the standard form of the traction engine had evolved and would change little over the next sixty years.
Until the quality of roads improved there was little demand for faster vehicles and engines were geared accordingly to cope with their use on rough roads and farm tracks.
Right through to the first decades of the twentieth century, manufacturers continued to seek a solution to realise the economic benefits of direct-pull ploughing and, particularly in North America, this led to the American development of the steam tractor. British companies such as Manns and Garrett developed potentially viable direct ploughing engines, however market conditions were against them and they failed to gain widespread popularity. These market conditions arose in the wake of the First World War when there was a glut of surplus equipment available as a result of British Government policy. Large numbers of Fowler ploughing engines had been constructed in order to increase the land under tillage during the war and many new light Fordson F tractors had been imported from 1917 onwards.
1.1. History Decline
Road steam disappeared through restrictions and charges that drove up their operating costs. Through 1921, steam tractors had demonstrated clear economic advantages over horse power for heavy hauling and short journeys. However, petrol lorries were starting to show better efficiency and could be purchased cheaply as war surplus; on a busy route a 3-ton petrol lorry could save about £100 per month compared to its steam equivalent, in spite of restrictive speed limits, and relatively high fuel prices and maintenance costs.
Throughout the 1920s and 1930s there were tighter restrictions on road steam haulage, including speed, smoke and vapour limits and a wetted tax, where the tax due was proportional to the size of the wetted area of the boiler; this made steam engines less competitive against domestically produced internal combustion engined units although imports were subject to taxes of up to 33%. As a result of the Salter Report on road funding, an axle weight tax was introduced in 1933 in order to charge commercial motor vehicles more for the costs of maintaining the road system and to do away with the perception that the free use of roads was subsidising the competitors of rail freight. The tax was payable by all road hauliers in proportion to the axle load and was particularly restrictive on steam propulsion, which was heavier than its petrol equivalent.
Initially, imported oil was taxed much more than British-produced coal, but in 1934 Oliver Stanley, the Minister for Transport, reduced taxes on fuel oils while raising the Road Fund charge on road locomotives to £100 per year, provoking protests by engine manufacturers, hauliers, showmen and the coal industry. This was at a time of high unemployment in the mining industry, when the steam haulage business represented a market of 950.000 tons of coal annually. The tax was devastating to the businesses of heavy hauliers and showmen and precipitated the scrapping of many engines.
The last new UK-built traction engines were constructed during the 1930s, although many continued in commercial use for many years while there remained experienced enginemen available to drive them.
1.2. History Preservation
From the 1950s, the preservation movement started to build as enthusiasts realised that traction engines were in danger of dying out. Many of the remaining engines were bought by enthusiasts, and restored to working order. Traction engine rallies began, initially as races between engine owners and their charges, later developing into the significant tourist attractions that take place in many locations each year.
The Traction Engine Register records the details of traction engines, steam road rollers, steam wagons, steam fire engines and portable engines that are known to survive in the United Kingdom and Irish Republic. It recorded 2851 self moving engines and wagons, 687 portable engines non-self moving, 160 steam fire engines existing in 2016. A new edition of the Register is planned in 2020. It was previously estimated in May 2011 by an unknown source that over 2.000 traction engines have been preserved. This figure may include engines preserved elsewhere in the world, particularly the US, Canada, Australia and New Zealand, but if so, is an underestimate. Comprehensive information on past UK manufacturers and their production is recorded by the Road Locomotive Society based in the UK.
2. OperationSee: steam engine for a description of how the actual engine worked.
Although the first traction engines employed a chain drive, it is more typical for large gears to be used to transfer the drive from the crankshaft to the rear axle.
The machines typically have two large powered wheels at the back and two smaller wheels for steering at the front. However, some traction engines used a four-wheel-drive variation, and some experimented with an early form of caterpillar track.
3. Types and usage
Traction engines saw commercial use in a variety of roles between the mid-nineteenth and mid-twentieth centuries. Each role required a machine with a different set of characteristics, and the traction engine evolved into a number of different types to suit these different roles.
3.1. Types and usage Agricultural general purpose engine
The most common form in the countryside. They were used for hauling and as a stationary power source. Even when farmers did not own such a machine they would rely upon it from time to time. Many farms would use draught horses throughout the year, but during the harvest, threshing contractors would travel from farm to farm hauling the threshing machine which would be set up in the field and powered from the engine – a good example of the moveable stationary engine.
3.2. Types and usage US agricultural traction engine
Favourable soil conditions meant that US traction engines usually pulled their ploughs behind them, thereby eliminating the complexities of providing a cable drum and extra gearing, hence simplifying maintenance. American traction engines were manufactured in a variety of sizes, with the 6 nhp Russell being the smallest commercially made, and the large engines made by Russell, Case, and Reeves being the largest.
3.3. Types and usage Steam tractor US
In North America, the term steam tractor usually refers to a type of agricultural tractor powered by a steam engine, used extensively in the late 19th and early 20th centuries.
3.4. Types and usage Steam tractor UK
In Great Britain, the term steam tractor is more usually applied to the smallest models of traction engine – typically those weighing below five tons for the engine to be single manned anything above had to be manned by at least two people; a driver and steersman; used for hauling small loads on public roads. Although known as light steam tractors, these engines are generally just smaller versions of the road locomotive.
They were popular in the timber trade in the UK, although variations were also designed for general light road haulage and showmans use.
The most popular of these designs was probably the Garrett 4CD, meaning 4 nominal horse power Compound.
3.5. Types and usage Road locomotive
Designed for haulage of heavy loads on public highways, it was common for two or even three to be coupled together to allow heavier loads to be handled.
The characteristic features of these engines are very large rear driving wheels fitted with solid rubber tyres, three-speed gearing most traction engine types have only two gears, rear suspension, and belly tanks to provide a greater range between the stops needed to replenish water. All these features are to improve the ride and performance of the engine, which were used for journeys of hundreds of miles. Most road locomotives are fitted with a winch drum on the back axle. This can be used by removing the driving pins from the rear wheels, allowing the drive train to power the winch drum instead of the wheels.
James Boydell worked with the British steam traction engine manufacturer Charles Burrell & Sons to produce road haulage engines from 1856 that used his Dreadnaught Wheels which were particularly suited to bad roads or off-road use.
A number of road locomotives are fitted with a crane boom on the front. The boom pivot is mounted on the front axle assembly and a small winch is mounted on an extension to the smokebox in front of the chimney, the cable passing over a sheave at the top of the boom arm. The winch is powered by bevel gears on a shaft driven directly from the engine, with some form of clutch providing raise/lower control. These road locomotives can be used to load a trailer as well as to haul it to a new location. They are often referred to as crane engines.
A particularly distinctive form of road locomotive was the showmans engine. These were operated by travelling showmen both to tow fairground equipment and to power it when set up, either directly or by running a generator. These could be highly decorated and formed part of the spectacle of the fair. Some were fitted with a small crane that could be used when assembling the ride.
3.6. Types and usage Steamroller
Related to the steam traction engine, the steam roller was used for road building and flattening ground. Typically designed with a single heavy roller in practice, usually a pair of adjacent rollers replacing the front wheels and axle, and smooth rear wheels without strakes.
Some traction engines were designed to be convertible: the same basic machine could be fitted with either standard treaded or tyred road wheels, or else smooth rolls – the changeover between the two being achieved in less than half a day.
4.1. Relatives of the traction engine Portable engine
A portable engine is a type of self-contained steam engine and boiler combination that may be moved from site to site. Although bearing a strong family resemblance, in both appearance and stationary operation, the portable engine is not classed as a traction engine as it is not self-propelled. However, it is included in this list because the traction engine is a direct descendant.
4.2. Relatives of the traction engine Steam wagon
A steam wagon is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry truck and came in two basic forms: overtype and undertype – the distinction being the position of the engine relative to the boiler. Among the firms that specialized in them in the 1900s was the short-lived Invicta Works of Maidstone, owned by Jesse Ellis.
The overtype had a steam engine mounted on top of a fire-tube boiler, in a similar manner to a traction engine. The front of an overtype steam wagon bears a close family resemblance to traction engines, and manufacturers who made both may well have been able to use some common parts.
The undertype had the steam engine mounted under the boiler, usually between the frames of the chassis. The boiler was usually mounted well forward and was often a vertical and/or water tube type.
Steam wagons were the dominant form of powered road traction for commercial haulage in the early part of the twentieth century, although they were a largely British phenomenon, with few manufacturers outside Great Britain. Competition from internal-combustion-powered vehicles and adverse legislation meant that few remained in commercial use beyond the Second World War.
4.3. Relatives of the traction engine Traction engines as railway locomotives
Several traction engine builders such as Aveling and Porter and Fowler built light railway locomotives based on their traction engines. In their crudest form these simply had flanged steel wheels to enable them to run on rails. More sophisticated models had the boiler and engine mounted on a chassis which carried railway-wagon style axles. The rear axle was driven from the engine by gear or chain-drive. These unusual locomotives were sold to small industries for use in shunting and marshalling duties, although they also found favour with engineering firms engaged in the construction of mainline railways for hauling men, equipment and materials over the partly constructed line.
- strake – name for the diagonal strips cast into or rivetted onto the wheel rims to provide traction on unmade ground similar to the tread on a pneumatic tyre.
- Nominal horse power – nhp is the typical way that traction engines are rated. However, it has long been accepted that nominal horse power greatly understates the actual power of the engine. There are many ways to estimate the actual horse power but none of them gives an accurate answer, for example, a 4 nhp engine is said to be approximately 36 hp 27 kW; however a 4 nhp engine can easily pull a laden 8-wheeler lorry while a diesel engine of 36 hp 27 kW cannot. Thus, many have resigned themselves that this debate will never be settled and, while nominal horsepower gives a convenient way of rating traction engines, it may never be converted accurately into diesel HP.
- spud or lug – strip of angled metal that could be bolted to the driving wheels to provide greater traction on soft or heavy ground. Spuds were often required on ploughing engines when moving across farmland.
6. Modern use
Although no longer used commercially, traction engines of all types continue to be maintained and preserved by enthusiastic individuals and are frequently exhibited at agricultural shows in Europe particularly the UK, Canada and the United States. They are often a main attraction in a live steam festival see List of steam fairs.
Model traction engines, powered by steam, are manufactured by several companies, notably Mamod and Wilesco. Larger scale model engines are popular subjects for model engineers to construct, either as a supplied kit of parts, or machined from raw materials.
7. Traction engines in popular cultureIn film
- In the 2004 film Tremors 4: The Legend Begins, the people of Rejection, Nevada had a traction engine and were proud of it. During the final battle, two of the characters fired their guns from the traction engine, and the traction engine rammed and killed the last graboid.
- The 1962 film The Iron Maiden featured a showmans engine as the films star, along with many others, at the annual rally at Woburn Abbey.
- Trevor the Traction Engine is one of the non-railway characters featured in The Railway Series of childrens books by the Rev. W. Awdry. Appearing in several of the books, the traction engine was originally saved from scrap by The Vicar of Wellsworth with the help of Edward the Blue Engine. Trevor has also appeared in a number of episodes in the TV spin-off Thomas & Friends. Another traction engine, Fergus the Railway Traction Engine, also appears in Thomas & Friends, but unlike Trevor, Fergus runs on rails instead of roads. Theo from Journey Beyond Sodor is based on a Brill Tramway No. 1.
- In the book Gumdrop and The Farmers Friend, by Val Biro, the vintage motor-car Gumdrop is rescued from a snowy ditch by "The Farmers Friend", a traction engine belonging to a local farmer. Some months later, the two vehicles are instrumental in thwarting a pair of car thieves. The end-papers of the book include a simplified cut-away drawing of the traction engine: a single-cylinder, 6 nhp Fowler light tractor, built in 1903.
- Traction engines for road haulage feature prominently in Keith Roberts alternate-history novel Pavane.
- In the 1960s, cutaway drawings of traction engines by Geoffrey Wheeler featured in Eagle comics and a Blue Peter annual.
- In the television play Threads, depicting the consequences of nuclear war in the United Kingdom, traction engines come back into use as petrol becomes unavailable.
- Fred Dibnah of Bolton, England was known as a National Institution in Great Britain for the conservation of old traction engines and other steam engines. His television series, Fred Dibnahs Made in Britain, shows him touring the United Kingdom in his rebuilt, 10 ton traction engine.