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Specifications
Specifications
Configuration:;
• Whyte	0-6-0PT
• UIC	C h2t (10); C n2t (200);
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 7+1⁄2 in (1.410 m)
Minimum curve	5 chains (330 ft; 100 m) normal,; 4.5 chains (300 ft; 91 m) slow;
Wheelbase	15 ft 6 in (4.72 m)
Length	33 ft 2 in (10.11 m) over buffers
Width	8 ft 7 in (2.616 m)
Height	12 ft 5+1⁄2 in (3.797 m)
Axle load	19 long tons 5 cwt (43,100 lb or 19.6 t) (21.6 short tons) full
Loco weight	55 long tons 7 cwt (124,000 lb or 56.2 t) (62.0 short tons) full
Fuel type	Coal
Water cap.	1,300 imp gal (5,900 L; 1,600 US gal)
Firebox:
• Grate area	17.40 sq ft (1.617 m2)
Boiler	GWR Standard No. 10
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	101.7 sq ft (9.45 m2)
• Tubes	1,245.7 sq ft (115.73 m2)
• Total surface	1,347 sq ft (125.1 m2)
Cylinders	Two, inside
Cylinder size	17+1⁄2 in × 24 in (444 mm × 610 mm)

Type and origin
Type and origin
Power type	Steam
Designer	Frederick Hawksworth
Builder	Swindon Works (10); R. Stephenson & Hawthorns (100); W. G. Bagnall (50); Yorkshire Engine Company (50);
Order number	GWR Lot Nos. 365, 382–387
Serial number	RSH: 7450–69, 7547–96, 7611–40; WGB: 2910–2959; YEC: 2443–72, 2544–53, 2575–84;
Build date	1947–1956
Total produced	210

Great Western Railway 9400 class
Great Western Railway 9400 class
	9405 at Paddington in 1947
Power type
Type and origin
Power type	Steam
Designer	Frederick Hawksworth
Builder	Swindon Works (10); R. Stephenson & Hawthorns (100); W. G. Bagnall (50); Yorkshire Engine Company (50);
Order number	GWR Lot Nos. 365, 382–387
Serial number	RSH: 7450–69, 7547–96, 7611–40; WGB: 2910–2959; YEC: 2443–72, 2544–53, 2575–84;
Build date	1947–1956
Total produced	210
Configuration:;
Specifications
Configuration:;
• Whyte	0-6-0PT
• UIC	C h2t (10); C n2t (200);
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 7+1⁄2 in (1.410 m)
Minimum curve	5 chains (330 ft; 100 m) normal,; 4.5 chains (300 ft; 91 m) slow;
Wheelbase	15 ft 6 in (4.72 m)
Length	33 ft 2 in (10.11 m) over buffers
Width	8 ft 7 in (2.616 m)
Height	12 ft 5+1⁄2 in (3.797 m)
Axle load	19 long tons 5 cwt (43,100 lb or 19.6 t) (21.6 short tons) full
Loco weight	55 long tons 7 cwt (124,000 lb or 56.2 t) (62.0 short tons) full
Fuel type	Coal
Water cap.	1,300 imp gal (5,900 L; 1,600 US gal)
Firebox:
• Grate area	17.40 sq ft (1.617 m2)
Boiler	GWR Standard No. 10
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	101.7 sq ft (9.45 m2)
• Tubes	1,245.7 sq ft (115.73 m2)
• Total surface	1,347 sq ft (125.1 m2)
Cylinders	Two, inside
Cylinder size	17+1⁄2 in × 24 in (444 mm × 610 mm)
Tractive effort
Performance figures
Tractive effort	22,515 lbf (100.15 kN)
Operators
Career
Operators	Great Western Railway; British Railways;
Class	9400 or 94XX
Power class	GWR: C; BR: 4F;
Numbers	9400–9499, 8400–8499, 3400–3409
Axle load class	GWR: Red
Locale	Western Region
Withdrawn	1959–1965
Preserved	9400, 9466
Disposition	Two preserved, remainder scrapped

The Great Western Railway (GWR) 9400 Class is a class of 0-6-0 pannier tank steam locomotive, used for shunting and banking duties.

The first ten 9400s were the last steam engines built by the GWR. After nationalisation in 1948, another 200 were built by private contractors for British Railways (BR). Most had very short working lives as the duties for which they were designed disappeared through changes in working practices or were taken over by diesel locomotives. Two locomotives survived into preservation, with the oldest of the class, 9400 as part of the National Collection.

Design

The 9400 class was the final development in a long lineage of tank locomotives that can be directly traced to the 645 Class of 1872. Over the decades details altered, the most significant being the adoption of Belpaire fireboxes necessitating pannier tanks.

The 9400 resembled a pannier tank version of the 2251 class, and indeed shared the same boiler and cylinders as the 2251, but was in fact a taper-boilered development of the 8750 subgroup of the 5700 class. The advantage was a useful increase in boiler power, but there was a significant weight penalty that restricted route availability. The 10 GWR-built locomotives had superheaters but the remainder did not.

The 9400s were numbered 9400–9499, 8400–8499 and 3400–3409. BR gave them the power classification 4F.

Build details

Table of orders and numbers^[2]
Lot No.	Fleet Nos.	Manufacturer	Serial Nos.	Date	Notes
365	9400–9409	Swindon Works	—	1947
382	9410–9459	Robert Stephenson and Hawthorns	7547–7596	1950–1951
383	9460–9489	Robert Stephenson and Hawthorns	7611–7640	1950–1953
384	8400–8449	W. G. Bagnall	2910–2959	1949–1954
385	8450–8479	Yorkshire Engine Company	2443–65/67–71/66/72	1949–1952
386	8480–8499	Robert Stephenson and Hawthorns	7450–7469	1952	under subcontract from Hudswell Clarke
387	9490–9499	Yorkshire Engine Company	2544–2553	1954–1955	under subcontract from Hunslet Engine Company
387	3400–3409	Yorkshire Engine Company	2575–2584	1955–1956	under subcontract from Hunslet Engine Company

No. 3409 was the last locomotive built for British mainline use by private contractors, as well as the last steam locomotive built for British Railways to a pre-nationalisation design. It was ordered by GWR in December 1947 and delivered by Yorkshire Engine Company in October 1956.^[3]

Operations

The 9400 Class migrated to most parts of the former GWR, with many based in South Wales and at Old Oak Common. Here they were used on Paddington empty stock work until the end of steam on the Western Region in 1965. A common sight on the departure side in 1964–1965 was a worn down 9400 Class locomotive without number plates waiting with a line of Mark 1 coaches.^{[citation needed]}

Numbers 8400 to 8406 served as bank engines on the Lickey Incline after its transferral to the Western Region.

Preservation

Two have been preserved:

GWR/BR No.	TOPS No.	Home base	Notes	Image
9400	n/a	Swindon Steam Railway Museum	Part of the National Railway Collection
9466	98466	West Somerset Railway	The locomotive is operational and mainline certified. Frequent visitor to the Mid-Norfolk Railway, the Metropolitan Line and other lines running charters, including a special funeral train for its owner. Formerly based at the Buckinghamshire Railway Centre privately owned by Dennis B Howells until his death in 2018,^[4] the locomotive was subsequently sold to JJP Holdings South West Ltd and was based at the West Somerset Railway after a short return visit to the Mid-Norfolk Railway.^[5] It was resident at the Ecclesbourne Valley Railway where it was to remain until its boiler ticket expires at the end of 2025.^[6]^[7] It has since moved back to the West Somerset Railway in early 2022 following analysis of weight restrictions on the line which concluded that the locomotive was safe to operate on the line once again. It will operate on the West Somerset Railway until its boiler ticket expires in 2025.^[8]

References

^ Champ, Jim (2018). An Introduction to Great Western Locomotive Development. Barnsley: Pen & Sword Transport. p. 320. ISBN 978-1-4738-7784-9. OCLC 1029234106. OL 26953051M.
^ Whitehurst 1973, pp. 32, 70, 73–74.
^ Atkins 1999, p. 51.
^ "Home". 9466 Locomotive Group. Retrieved 26 June 2019.
^ "(home)". Mid-Norfolk Railway. Retrieved 26 June 2019.
^ "Virtual Engine Shed". Ecclesbourne Valley Railway. Retrieved 26 May 2021.
^ "Steam Locomotive 9466 set for Ecclesbourne stay until 2025". Rail Advent. Retrieved 26 May 2021.
^ "Pannier steam locomotive to see out boiler ticket in Somerset". Rail Advent. Retrieved 23 February 2022.

Sources

Atkins, Philips (1999). The Golden Age of Steam Locomotive Building. Penryn, Cornwall: Atlantic Transport Publishers and the National Railway Museum. ISBN 0-906899-87-7. OCLC 468585665.
Russell, J.H. (1975). A Pictorial Record of Great Western Engines.
Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. pp. 32, 70, 73–74, 82, 102, 158. ISBN 978-0-9028-8821-0. OCLC 815661.