GWR 4000 Class

Specifications
Specifications
Configuration:;
• Whyte	4-6-0 (prototype built as 4-4-2 but rebuilt to 4-6-0 1909).
• UIC	2′C h4
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8+1⁄2 in (2.045 m)
Trailing dia.	4 ft 1+1⁄2 in (1.257 m) (4-4-2 only)
Wheelbase	Loco: 27 ft 3 in (8.31 m)
Loco weight	75.8 long tons (77.0 t; 84.9 short tons)
Tender weight	40 long tons (41 t; 45 short tons)
Water cap.	3,500 or 4,000 imp gal (16,000 or 18,000 L; 4,200 or 4,800 US gal)
Firebox:
• Grate area	27.1 sq ft (2.52 m2)
Boiler	GWR Standard No. 1 (with variations)
Boiler pressure	225 psi (1.55 MPa)
Heating surface:
• Firebox	154.8 sq ft (14.38 m2)
• Tubes	1,686.6 sq ft (156.69 m2)
Superheater	"Swindon No. 3"
Cylinders	4, (2 outside, 2 inside)
Cylinder size	14+1⁄4 in × 26 in (362 mm × 660 mm) -; 15 in × 26 in (381 mm × 660 mm)
Valve gear	Walschaerts inside
Valve type	Piston valves

Type and origin
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Order number	Lots 161, 168, 173, 178, 180, 195, 199, 217
Build date	1906–1923
Total produced	73

Great Western Railway 4000 *Star* class
Great Western Railway 4000 Star class
	4003 Lode Star
Power type
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Order number	Lots 161, 168, 173, 178, 180, 195, 199, 217
Build date	1906–1923
Total produced	73
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-0 (prototype built as 4-4-2 but rebuilt to 4-6-0 1909).
• UIC	2′C h4
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8+1⁄2 in (2.045 m)
Trailing dia.	4 ft 1+1⁄2 in (1.257 m) (4-4-2 only)
Wheelbase	Loco: 27 ft 3 in (8.31 m)
Loco weight	75.8 long tons (77.0 t; 84.9 short tons)
Tender weight	40 long tons (41 t; 45 short tons)
Water cap.	3,500 or 4,000 imp gal (16,000 or 18,000 L; 4,200 or 4,800 US gal)
Firebox:
• Grate area	27.1 sq ft (2.52 m2)
Boiler	GWR Standard No. 1 (with variations)
Boiler pressure	225 psi (1.55 MPa)
Heating surface:
• Firebox	154.8 sq ft (14.38 m2)
• Tubes	1,686.6 sq ft (156.69 m2)
Superheater	"Swindon No. 3"
Cylinders	4, (2 outside, 2 inside)
Cylinder size	14+1⁄4 in × 26 in (362 mm × 660 mm) -; 15 in × 26 in (381 mm × 660 mm)
Valve gear	Walschaerts inside
Valve type	Piston valves
Tractive effort
Performance figures
Tractive effort	25,090 lbf (111.61 kN) - 27,800 lbf (123.66 kN)
Operators
Career
Operators	Great Western Railway; British Railways;
Class	4000 or Star
Power class	GWR: D; BR: 5P;
Numbers	4000–4072
Axle load class	GWR: Red
Withdrawn	1926–1957
Disposition	15 rebuilt as Castle class, 1 preserved, remainder scrapped.

The Great Western Railway 4000 or Star were a class of 4-cylinder 4-6-0 passenger steam locomotives designed by George Jackson Churchward for the Great Western Railway (GWR) in 1906 and introduced from early 1907. The prototype was built as a 4-4-2 Atlantic (but converted to 4-6-0 during 1909). They proved to be a successful design which handled the heaviest long-distance express trains, reaching top speeds of 90 mph (145 km/h), and established the design principles for GWR 4-cylinder classes over the next twenty-five years.