LNWR Webb Experiment Class

LNWR Experiment Class

No.301 Economist

Type and origin
Power type	Steam
Designer	F. W. Webb
Builder	Crewe Works
Serial number	2500, 2625–2628, 2669–2673, 2734–2753
Build date	1882–84
Total produced	30

Specifications
Configuration:
• Whyte	2-(2-2)-0
• UIC	1AA n3v
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Leading dia.	3 ft 6 in (1.067 m)
Driver dia.	6 ft 6 in (1.981 m)
Loco weight	38 long tons (39 t)
Fuel type	Coal
Heating surface	1,083.5 sq ft (100.66 m²)
Cylinders	Three: two high pressure outside, driving rear wheels; one low pressure inside, driving front drivers
High-pressure cylinder	13 in × 24 in (330 mm × 610 mm)
Low-pressure cylinder	26 in × 24 in (660 mm × 610 mm)
Valve gear	Independent Joy valve gear for HP and LP

Career
Operators	London and North Western Railway
Withdrawn	1903–1904
Scrapped	1904–1905
Disposition	All scrapped

The London and North Western Railway Experiment Class was a series of 30 three-cylinder 2-(2-2)-0 compound locomotives designed by Francis Webb for the London and North Western Railway between 1882 and 1884. They were Webb’s first large-scale experiment with a class of express compound locomotives, and the first engine was named accordingly. They were followed by a class of similar, but larger locomotives, that featured larger boilers and smaller driving wheels – the LNWR Dreadnought class.

After Webb's retirement, his successor, George Whale, withdrew the Experiment class locomotives soon after he took up office in 1903.

Accidents and incidents

On 22 December 1894, a gust of wind blew a wagon into a rake of wagons at Chelford, Cheshire. They were derailed and fouled the main line. Locomotive No. 520 Express was one of two hauling an express passenger train that collided with the wagons and was derailed. 14 people were killed and 48 were injured.

Locomotives

Table of locomotives
LNWR No.	Name	Crewe Works No.	Date built	Date scrapped
66	Experiment	2500	000000001882-01-01-0000January 1882	000000001905-02-01-0000February 1905
300	Compound	2625	000000001883-02-01-0000February 1883	000000001905-07-01-0000July 1905
301	Economist	2626	000000001883-03-01-0000March 1883	000000001904-10-01-0000October 1904
302	Velocipede	2627	000000001883-04-01-0000April 1883	000000001905-07-01-0000July 1905
303	Hydra	2628	000000001883-04-01-0000April 1883	000000001905-01-01-0000January 1905
305	Trentham	2669	000000001883-07-01-0000July 1883	000000001904-06-01-0000June 1904
306	Knowsley	2670	000000001883-07-01-0000July 1883	000000001905-07-01-0000July 1905
307	Victor	2671	000000001883-07-01-0000July 1883	000000001905-02-01-0000February 1905
520	Express	2672	000000001883-07-01-0000July 1883	000000001905-04-01-0000April 1905
519	Shooting Star	2673	000000001883-07-01-0000July 1883	000000001905-02-01-0000February 1905
311	Richard Francis Roberts	2734	000000001884-01-01-0000January 1884	000000001905-07-01-0000July 1905
315	Alaska	2735	000000001884-02-01-0000February 1884	000000001905-07-01-0000July 1905
321	Servia	2736	000000001884-02-01-0000February 1884	000000001905-01-01-0000January 1905
323	Britannic	2737	000000001884-02-01-0000February 1884	000000001905-03-01-0000March 1905
333	Germanic	2738	000000001884-02-01-0000February 1884	000000001904-11-01-0000November 1904
353	Oregon	2739	000000001884-02-01-0000February 1884	000000001905-07-01-0000July 1905
363	Aurania	2740	000000001884-02-01-0000February 1884	000000001905-02-01-0000February 1905
365	America	2741	000000001884-03-01-0000March 1884	000000001905-04-01-0000April 1905
366	City of Chicago	2742	000000001884-03-01-0000March 1884	000000001905-05-01-0000May 1905
310	Sarmatian	2743	000000001884-03-01-0000March 1884	000000001904-11-01-0000November 1904
1102	Cyclops	2744	000000001884-05-01-0000May 1884	000000001904-10-01-0000October 1904
1120	Apollo	2745	000000001884-06-01-0000June 1884	000000001905-12-01-0000December 1905
1104	Sunbeam	2746	000000001884-06-01-0000June 1884	000000001905-01-01-0000January 1905
1113	Hecate	2747	000000001884-06-01-0000June 1884	000000001904-08-01-0000August 1904
1111	Messenger	2748	000000001884-06-01-0000June 1884	000000001905-02-01-0000February 1905
1115	Snake	2749	000000001884-07-01-0000July 1884	000000001905-03-01-0000March 1905
1116	Friar	2750	000000001884-07-01-0000July 1884	000000001905-08-01-0000August 1905
1117	Penguin	2751	000000001884-07-01-0000July 1884	000000001904-10-01-0000October 1904
372	Empress	2752	000000001884-07-01-0000July 1884	000000001905-06-01-0000June 1905
374	Emperor	2753	000000001884-07-01-0000July 1884	000000001905-09-01-0000September 1905

References

Baxter, Bertram (1979). Baxter, David, ed. British Locomotive Catalogue 1825–1923, Volume 2B: London and North Western Railway and its constituent companies. Ashbourne, Derbyshire: Moorland Publishing Company. p. 194. ISBN 0-903485-84-2.

London and North Western Railway locomotives
John Ramsbottom (North Eastern Division 1846–1857)
Francis Trevithick (Northern Division 1846–1857)	SFB passenger 187 Velocipede 173 Cornwall 290 Rocket LFB passenger 7ft Single (Raven) 176 Courier SFB goods LFB goods SFB goods tank LFB goods tank
John Ramsbottom (Northern Division 1857–1862)	3020 Cornwall (renewed) 271 DX Problem / Lady of the Lake
Edward Bury (Southern Division 1846–1847)	Bury Bar Frame locomotive
James McConnell (Southern Division 1847–1862)	Bloomer McConnell Goods Wolverton Express Goods
John Ramsbottom (1862–1871)	4ft Shunter Samson Newton Special Tank
Francis William Webb (1871–1903)	Alfred the Great Coal Engine Coal Tank Experiment Dreadnought Teutonic Greater Britain John Hick Dock Tank Precursor Precedent Improved Precedent Jubilee Waterloo 4ft 6in Tank 5ft 6in Tank 18in Goods (Cauliflower) 18in Tank A B 1400 Class
George Whale (1903–1909)	Experiment 19in Express Goods Precursor Precursor Tank Renown C D E F G
Charles John Bowen Cooke (1909–1920)	1185 Claughton George V Queen Mary Prince of Wales Prince of Wales Tank C1 G1 MM
H. P. M. Beames (1920–1921)	380 G2 G2A
George Hughes (1922–1923)	No new locomotive classes
Locomotives of the London and North Western Railway LMS locomotives British Railways steam locomotives

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