LNWR Dreadnought Class

LNWR Dreadnought class

No. 507 Marchioness of Stafford

Type and origin
Power type	Steam
Designer	F. W. Webb
Builder	Crewe Works
Serial number	2975–2804, 2886–2905, 3012–3021
Build date	1884–1888
Total produced	40

Specifications
Configuration	2-2-2-0
UIC class	1AA n3v
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Leading dia.	3 ft 6 in (1.067 m) + tyres
Driver dia.	6 ft 0 in (1.829 m) + tyres
Wheelbase: • Engine	18 ft 1 in (5.51 m)
• Leading	8 ft 5 in (2.57 m)
• Drivers	9 ft 8 in (2.95 m)
Loco weight	43 long tons (44 t)
Boiler:
• Diameter	4 ft 2 in (1.27 m)
• Tube plates	11 ft 0 in (3.35 m)
Boiler pressure	175 lbf/in² (1.21 MPa)
Heating surface	1,401.5 sq ft (130.20 m²)
Cylinders	Three: two HP (outside), one LP (inside)
High-pressure cylinder	14 in × 24 in (356 mm × 610 mm)
Low-pressure cylinder	30 in × 24 in (762 mm × 610 mm)
Valve gear	Joy

Career
Operators	London and North Western Railway
Scrapped	December 1903 – July 1905
Disposition	All scrapped

The LNWR Dreadnought class was a class of 40 passenger three-cylinder compound 2-2-2-0 locomotives designed by F. W. Webb for the London and North Western Railway, and manufactured by them in their Crewe Works between 1884 and 1888.

Design

The design featured a boiler pressed to 175 lbf/in² (1.21 MPa) delivering saturated steam to two outside 14-inch (356 mm) high-pressure cylinders, which exhausted to one 30-inch (762 mm) low-pressure cylinder inside the frames. All three cylinders had a stroke of 24 inches (610 mm); the high-pressure cylinders drove the rear wheels, while the low-pressure drove the leading driving wheels. As the two pairs of driving wheels were not connected, the locomotives were "duplex drive" or "double-singles".

They were a development of Webb's Experiment class; they had larger boilers and smaller driving wheels, and while the Joy valve gear for the HP and LP cylinders could still be independently adjusted, it was now also possible to reverse both sets simultaneously. The inside valve gear was subsequently amended to the loose or slip-eccentric system, thus giving automatic reversal.^[1]

Decline

When George Whale become chief mechanical engineer of the LNWR in 1903, he started a programme of eliminating Webb's over-complicated duplex compound locomotives. Consequently, the class was scrapped between December 1903, and July 1905, having been replaced by Whale's Experiment class.

Table of locomotives^[2]
LNWR No.	LNER Name	Crewe Works No.	Date built	Date scrapped	Notes
503	Dreadnought	2795	000000001884-09-01-0000Sep 1884	000000001904-04-01-0000Apr 1904
508	Titan	2796	000000001884-10-01-0000Oct 1884	000000001904-02-01-0000Feb 1904
504	Thunderer	2797	000000001885-02-01-0000Feb 1885	000000001904-08-01-0000Aug 1904
507	Marchioness of Stafford	2798	000000001885-03-01-0000Mar 1885	000000001905-07-01-0000Jul 1905
509	Ajax	2799	000000001885-03-01-0000Mar 1885	000000001904-04-01-0000Apr 1904
510	Leviathan	2800	000000001885-04-01-0000Apr 1885	000000001904-05-01-0000May 1904
511	Achilles	2801	000000001885-05-01-0000May 1885	000000001904-08-01-0000Aug 1904
513	Mammoth	2802	000000001885-05-01-0000May 1885	000000001904-03-01-0000Mar 1904
515	Niagara	2803	000000001885-05-01-0000May 1885	000000001904-11-01-0000Nov 1904
685	Himalaya	2804	000000001885-05-01-0000May 1885	000000001904-09-01-0000Sep 1904
2055	Dunrobin	2886	000000001885-12-01-0000Dec 1885	000000001905-01-01-0000Jan 1905
2056	Argus	2887	000000001885-12-01-0000Dec 1885	000000001904-04-01-0000Apr 1904
2057	Euphrates	2888	000000001885-12-01-0000Dec 1885	000000001904-07-01-0000Jul 1904
2058	Medusa	2889	000000001885-12-01-0000Dec 1885	000000001905-02-01-0000Feb 1905
2059	Greyhound	2890	000000001885-12-01-0000Dec 1885	000000001905-02-01-0000Feb 1905
2060	Vandal	2891	000000001885-12-01-0000Dec 1885	000000001904-07-01-0000Jul 1904
2061	Harpy	2892	000000001885-12-01-0000Dec 1885	000000001905-04-01-0000Apr 1905
2062	Herald	2893	000000001885-12-01-0000Dec 1885	000000001905-07-01-0000Jul 1905
2063	Huskisson	2894	000000001885-12-01-0000Dec 1885	000000001904-09-01-0000Sep 1904
2064	Autocrat	2895	000000001885-12-01-0000Dec 1885	000000001905-03-01-0000Mar 1905
173	City of Manchester	2896	000000001886-03-01-0000Mar 1886	000000001904-08-01-0000Aug 1904
2	City of Carlisle	2897	000000001886-03-01-0000Mar 1886	000000001904-06-01-0000Jun 1904
1539	City of Chester	2898	000000001886-06-01-0000Jun 1886	000000001904-07-01-0000Jul 1904	Renumbered 437 in November 1886
410	City of Liverpool	2899	000000001886-06-01-0000Jun 1886	000000001904-04-01-0000Apr 1904
1353	City of Edinburgh	2900	000000001886-06-01-0000Jun 1886	000000001904-07-01-0000Jul 1904
1370	City of Glasgow	2901	000000001886-06-01-0000Jun 1886	000000001904-01-01-0000Jan 1904
1395	Archimedes	2902	000000001886-06-01-0000Jun 1886	000000001904-03-01-0000Mar 1904
1379	Stork	2903	000000001886-06-01-0000Jun 1886	000000001905-02-01-0000Feb 1905
545	Tamerlane	2904	000000001886-07-01-0000Jul 1886	000000001903-12-01-0000Dec 1903
659	Rowland Hill	2905	000000001886-07-01-0000Jul 1886	000000001904-05-01-0000May 1904
637	City of New York	3012	000000001888-03-01-0000Mar 1888	000000001904-08-01-0000Aug 1904
638	City of Paris	3013	000000001888-04-01-0000Apr 1888	000000001904-11-01-0000Nov 1904
639	City of London	3014	000000001888-05-01-0000May 1888	000000001904-10-01-0000Oct 1904
640	City of Dublin	3015	000000001888-05-01-0000May 1888	000000001904-01-01-0000Jan 1904
641	City of Lichfield	3016	000000001888-05-01-0000May 1888	000000001904-02-01-0000Feb 1904
643	Raven	3017	000000001888-05-01-0000May 1888	000000001904-10-01-0000Oct 1904
644	Vesuvius	3018	000000001888-06-01-0000Jun 1888	000000001904-07-01-0000Jul 1904
645	Alchymist	3019	000000001888-06-01-0000Jun 1888	000000001905-01-01-0000Jan 1905
647	Ambassador	3020	000000001888-06-01-0000Jun 1888	000000001904-04-01-0000Apr 1904
648	Swiftsure	3021	000000001888-06-01-0000Jun 1888	000000001904-10-01-0000Oct 1904

References

↑ Baxter 1979, pp. 194–195.
↑ Baxter 1979, p. 195.

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. 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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