British Rail 18000 was a prototype mainline gas turbine-electric locomotive built for

British Rail British Railways (BR), which from 1965 traded as British Rail, was a state-owned company that operated most of the overground rail transport in Great Britain from 1948 to 1997. It was formed from the nationalisation of the Big Four (British ra ...

ways in 1949 by

Brown, Boveri & Cie Brown, Boveri & Cie. (Brown, Boveri & Company; BBC) was a Swiss group of electrical engineering companies. It was founded in Zürich, in 1891 by Charles Eugene Lancelot Brown and Walter Boveri who worked at the Maschinenfabrik Oerlikon. In 19 ...

. An earlier gas-turbine locomotive, 18100, had been ordered from

Metropolitan-Vickers Metropolitan-Vickers, Metrovick, or Metrovicks, was a British heavy electrical engineering company of the early-to-mid 20th century formerly known as British Westinghouse. Highly diversified, it was particularly well known for its industrial el ...

by the

Great Western Railway The Great Western Railway (GWR) was a British railway company that linked London with the southwest, west and West Midlands of England and most of Wales. It was founded in 1833, received its enabling Act of Parliament on 31 August 1835 and ran ...

but construction was delayed due to

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...

; a second, 18000, was thus ordered from Switzerland in 1946. It spent its working life on the

Western Region of British Railways The Western Region was a region of British Railways from 1948. The region ceased to be an operating unit in its own right on completion of the "Organising for Quality" initiative on 6 April 1992. The Region consisted principally of ex-Great We ...

, operating express passenger services from Paddington station, London.

Overview

The GWR chose a gas-turbine locomotive because, at the time, there was no single-unit

diesel locomotive A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving whee ...

of sufficient power available. The King class

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the loco ...

could deliver about at the rail. The LMS diesel locomotives had engines of only . After allowing for transmission losses, this would be down to about at the rail, so two diesels would be needed to match a King. No. 18000 was of A1A-A1A wheel arrangement and its

gas turbine A gas turbine, also called a combustion turbine, is a type of continuous flow internal combustion engine. The main parts common to all gas turbine engines form the power-producing part (known as the gas generator or core) and are, in the directio ...

was rated at . It had a maximum speed of and weighed . It was painted in BR black livery, with a silver stripe around the middle of the body and silver numbers.

Technical details

Gas turbine

The

was a Brown Boveri industrial machine. It was of a type which would now be called a

turboshaft A turboshaft engine is a form of gas turbine that is optimized to produce shaftpower rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust ...

engine but differed from modern free-turbine turboshaft engines in having only one turbine to drive both the compressor and the output shaft. The emphasis was on fuel economy so it had a

heat exchanger A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct conta ...

(to recover

waste heat Waste heat is heat that is produced by a machine, or other process that uses energy, as a byproduct of doing work. All such processes give off some waste heat as a fundamental result of the laws of thermodynamics. Waste heat has lower utilit ...

from the exhaust) and was designed to run on cheap heavy

fuel oil Fuel oil is any of various fractions obtained from the distillation of petroleum (crude oil). Such oils include distillates (the lighter fractions) and residues (the heavier fractions). Fuel oils include heavy fuel oil, marine fuel oil (MFO), b ...

(it was also able to burn light oil but this was intended only for startup purposes). This was the same fuel that was used in oil-fired steam locomotives. After leaving the heat exchanger, the pre-heated air entered a large, vertical, combustion chamber where the fuel was injected and burned.

Auxiliary diesel engine

There was also an auxiliary

diesel engine The diesel engine, named after Rudolf Diesel, is an internal combustion engine in which ignition of the fuel is caused by the elevated temperature of the air in the cylinder due to mechanical compression; thus, the diesel engine is a so-cal ...

which provided power for starting the gas turbine. The diesel engine was capable of moving the locomotive at a slow speed when the gas turbine was not running. The usual procedure was to run the locomotive from the shed to Paddington station using the diesel engine and to start the gas turbine only a few minutes before the train was due to leave. This saved fuel and minimised annoyance from noise and exhaust fumes.

Problems

It proved a troublesome machine in service. Ash from the heavy fuel oil damaged the turbine blades, and the combustion chamber liner required frequent replacement due to damage. The electrical control systems were extremely complex for the time and gave much trouble; maintenance of the electrical equipment in a steam locomotive environment and knowledge base was difficult. Part way through its life one of the traction motors failed and instead of repairing or replacing it, it was simply removed, leaving the locomotive with only three traction motors and preventing it from achieving its full power output. It also suffered from the destruction of its heat exchanger in a fire at Temple Meads when combustion deposits in the exhaust side of the heat exchanger ignited.

Fuel costs

It was also much more expensive to run than expected. The efficiency of a gas turbine reduces dramatically at low power outputs so, to achieve respectable fuel economy, a gas turbine locomotive needs to be operated as much as possible at full power, with periods of part-load running reduced to a minimum. However, it turned out that, even on demanding express passenger schedules, it was not possible to operate the locomotive on full power for very much of the run and extended periods of part-load operation were inevitable, which resulted in heavy fuel consumption. It was also sometimes operated on the much more expensive and scarce light oil normally used only for starting, due to the level of wear caused by the ash from heavy fuel oil.

Performance

When reliable operation could be achieved, it did show itself capable of meeting expectations. Unfortunately, however, it was neither possible to achieve a consistently acceptable level of reliability nor to operate it under conditions which would allow reasonable fuel economy.

Comparison of 18000 and 18100

The following table gives a comparison between 18000 and 18100. There are some anomalies and these are described in the notes.

Post-BR use

ETH-BIB SIK 01-002718 BR 18000 Bellinzona 1967

At the end of 1960, 18000 was withdrawn from operation and was stored at Swindon Works for four years. It then returned to mainland Europe, where for more than ten years it was used, in substantially altered (and no longer gas-turbine-powered) form, for experiments concerning the interaction between steel wheels and steel rails, under the auspices of the

International Union of Railways The International Union of Railways (UIC, french: Union internationale des chemins de fer) is an international rail transport industry body. History The railways of Europe originated as many separate concerns, and there were many border chang ...

. In 1975 it was moved to

Vienna en, Viennese , iso_code = AT-9 , registration_plate = W , postal_code_type = Postal code , postal_code = , timezone = CET , utc_offset = +1 , timezone_DST ...

and displayed outside the Mechanical Engineering Testing building of the

Arsenal An arsenal is a place where arms and ammunition are made, maintained and repaired, stored, or issued, in any combination, whether privately or publicly owned. Arsenal and armoury (British English) or armory (American English) are mostl ...

research centre.

Preservation

In the early 1990s it was secured for preservation. It returned to the UK and was kept at The Railway Age,

Crewe Crewe () is a railway town and civil parish in the unitary authority of Cheshire East in Cheshire, England. The Crewe built-up area had a total population of 75,556 in 2011, which also covers parts of the adjacent civil parishes of Willaston ...

. It was then moved to

Barrow Hill Engine Shed Barrow Hill Roundhouse, until 1948 known as Staveley Engine Shed, is a former Midland Railway roundhouse in Barrow Hill, near Staveley and Chesterfield, Derbyshire (), now serving as a railway heritage centre. History Staveley Roundhouse wa ...

and was repainted in green livery. ;Exhibited at Gloucestershire Warwickshire Railway In mid-April 2010 it was delivered to the Gloucestershire Warwickshire Railway in order to take part (as a static exhibit) in the celebrations for the 175th birthday of the Great Western Railway from 29 May to 6 June 2010. ;Moved to Didcot Railway Centre Since then, it has moved to Didcot. It arrived at the yard, west of Didcot Parkway railway station, on 20 July 2011 and was moved into Didcot Railway Centre on 29 July 2011. It is now owned by the

Pete Waterman Peter Alan Waterman, (born 15 January 1947) is an English record producer, songwriter, radio and club DJ, television presenter, president of Coventry Bears rugby league club and a keen railway enthusiast. As a member of the Stock Aitken Water ...

Trust.

Models

18000 is made as a kit and ready-to-run in OO gauge by Silver Fox Models. A further ready-to run version is planned in 2020 by Rails of Sheffield.

References

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