GWR_4575_Class Knowpia

Specifications
Specifications
Configuration:;
• Whyte	2-6-2T
• UIC	1′C1′ h2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	4 ft 7+1⁄2 in (1.410 m)
Trailing dia.	3 ft 2 in (0.965 m)
Minimum curve	5 chains (330 ft; 100 m) normal,; 4.5 chains (300 ft; 91 m) slow
Wheelbase	26 ft 10 in (8.18 m)
Length	36 ft 4+1⁄2 in (11.09 m) over buffers
Width	8 ft 9 in (2.667 m)
Height	13 ft 0 in (3.962 m)
Axle load	15 long tons 11 cwt (34,800 lb or 15.8 t); (17.4 short tons) full
Adhesive weight	46 long tons 5 cwt (103,600 lb or 47 t); (51.8 short tons) full
Loco weight	61 long tons 0 cwt (136,600 lb or 62 t); (68.3 short tons) full
Fuel type	Coal
Fuel capacity	3 long tons 14 cwt (8,300 lb or 3.8 t)
Water cap.	1,300 imp gal (5,900 L; 1,600 US gal)
Firebox:
• Grate area	16.6 sq ft (1.54 m2)
Boiler	GWR Standard No. 5
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	94.25 sq ft (8.756 m2)
• Tubes	992.51 sq ft (92.207 m2)
Superheater:;
• Type	4-element or 6-element
• Heating area	4-element: 52.98 sq ft (4.922 m2),; 6-element: 69.84 sq ft (6.488 m2)
Cylinders	Two, outside
Cylinder size	17 in × 24 in (432 mm × 610 mm)
Valve gear	Stephenson
Valve type	piston valves
Train brakes	Vacuum

Type and origin
Type and origin
Power type	Steam
Designer	Charles Collett
Builder	GWR Swindon Works
Order number	Lots 242, 249, 251, 253
Build date	1927–1929
Total produced	100

GWR 4575 class
GWR 4575 class
	4598, freshly repaired at Swindon Works
Power type
Type and origin
Power type	Steam
Designer	Charles Collett
Builder	GWR Swindon Works
Order number	Lots 242, 249, 251, 253
Build date	1927–1929
Total produced	100
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-2T
• UIC	1′C1′ h2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	4 ft 7+1⁄2 in (1.410 m)
Trailing dia.	3 ft 2 in (0.965 m)
Minimum curve	5 chains (330 ft; 100 m) normal,; 4.5 chains (300 ft; 91 m) slow
Wheelbase	26 ft 10 in (8.18 m)
Length	36 ft 4+1⁄2 in (11.09 m) over buffers
Width	8 ft 9 in (2.667 m)
Height	13 ft 0 in (3.962 m)
Axle load	15 long tons 11 cwt (34,800 lb or 15.8 t); (17.4 short tons) full
Adhesive weight	46 long tons 5 cwt (103,600 lb or 47 t); (51.8 short tons) full
Loco weight	61 long tons 0 cwt (136,600 lb or 62 t); (68.3 short tons) full
Fuel type	Coal
Fuel capacity	3 long tons 14 cwt (8,300 lb or 3.8 t)
Water cap.	1,300 imp gal (5,900 L; 1,600 US gal)
Firebox:
• Grate area	16.6 sq ft (1.54 m2)
Boiler	GWR Standard No. 5
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	94.25 sq ft (8.756 m2)
• Tubes	992.51 sq ft (92.207 m2)
Superheater:;
• Type	4-element or 6-element
• Heating area	4-element: 52.98 sq ft (4.922 m2),; 6-element: 69.84 sq ft (6.488 m2)
Cylinders	Two, outside
Cylinder size	17 in × 24 in (432 mm × 610 mm)
Valve gear	Stephenson
Valve type	piston valves
Train brakes	Vacuum
Tractive effort
Performance figures
Tractive effort	21,250 lbf (94.5 kN)
Operators
Career
Operators	GWR » BR
Class	4575
Power class	GWR: C,; BR: 4MT
Number in class	100
Numbers	4575–4599, 5500–5574
Nicknames	Small Prairie
Axle load class	GWR: Yellow
Withdrawn	1956–1964
Preserved	4588, 5521, 5526, 5532, 5538, 5539, 5541, 5542, 5552, 5553, 5572
Disposition	11 preserved, remainder scrapped

The Great Western Railway (GWR) 4575 Class is a class of 2-6-2T British steam locomotives.

History edit

They were designed as small mixed traffic branch locomotives, mainly used on branch lines. They were a development of Churchward's 4500 Class with larger side tanks and increased water capacity.^[2] 100 were built numbered 4575–4599 and 5500–5574. 15 (Nos. 4578/81/89, 5511/24/29/34/35/45/55/59/60/68/72/74) were fitted with auto apparatus in 1953 to enable them to run push-pull trains on South Wales lines with auto trailers.^[2]

They often are referred to as Small Prairie Class tank locomotives.

Table of orders and numbers^[3]
Year	Quantity	Lot No.	Locomotive numbers
1927	30	242	4575–4599, 5500–5504
1927	20	249	5505–5524
1928	20	251	5525–5544
1928–29	30	253	5545–5574

Preservation edit

11 members of the class have been preserved:

Number and name	Home	Status
4588	Peak Rail	Has run in preservation, but currently out of service requiring overhaul. It was sold from the Dartmouth Steam Railway in 2015 and is now owned by Mike Thompson and based at Peak Rail.^[4]
5521/L.150	Epping Ongar Railway^[5]	Built in 1927, withdrawn by BR and sent to Woodham Brothers scrapyard, having run just over 1,000,000 miles (1,600,000 km). Saved with classmates 4561 and 5542 by the West Somerset Railway Association, but was sold with 5542 to repay purchase debts and to fund restoration of 4561. Bought by Richard and William Parker in 1980, it was restored at the Flour Mill, Forest of Dean from 2004 to 2007. It was featured in the 2007 Wolsztyn Parade, then travelled to Budapest, Hungary where it worked intermittently with MAV Nosztalgia, including piloting the Orient Express. It returned to Poland in 2008, operating suburban services from Wroclaw to Jelcz Laskowice. After a third appearance at the 2009 Wolsztyn Parade, it was returned to England. In May 2013, it was painted in London Transport livery and numbered L.150 to commemorate the 150th anniversary of the Metropolitan line. Returned to traffic in 2021 following overhaul.^[6]
5526	South Devon Railway	On loan to the Gwili Railway. Boiler ticket expires in 2027.
5532	Llangollen Railway	Under restoration.^[7]
5538	The Flour Mill, Forest of Dean, Gloucestershire	Under restoration. Previously displayed in Barry Island.^[8]
5539	Barry Tourist Railway	Under restoration. Previously part of the Barry Ten until 2006.^[9]
5541	Dean Forest Railway	Currently operational. Boiler ticket expires in 2024.^[10]
5542	South Devon Railway	Currently under overhaul at the South Devon Railway. This locomotive has visited several preserved railways throughout her preservation career.^[11]
5552	Bodmin and Wenford Railway	Returned to service in 2023 after overhaul, having previously run from 2003 to 2013.^[12]
5553	Peak Rail	Owned by Pete Waterman. Last steam engine to leave Woodham Brothers scrapyard in Barry, Vale of Glamorgan, South Wales, in January 1990. First resteamed in 2002, running until 2012, mostly at the West Somerset Railway. Moved in 2015 from Crewe Heritage Centre for overhaul, which was completed in 2021 at Peak Rail. Currently operational, boiler ticket expires 2031.
5572	Didcot Railway Centre	On static display awaiting overhaul.^[13]

Two members of the class have also briefly been out on the mainline: 5521 and 5572. 5521 was shipped to Poland to take part in the Wolsztyn Parade, as well as briefly piloting the Orient Express. 5572 made an appearance at an open day in Reading as part of the GWR150 celebrations in 1985, arriving under its own power. When returning to Didcot again under its own power the engine also hauled the replica broad gauge locomotive "Iron Duke" alongside the preserved GWR Railcar W22W.

In fiction edit

4566 with a GWR Shirtbutton logo was featured in the train chase sequence from the 1978 Disney film Candleshoe.

Models and toys edit

Lima made a model of the 4575 class, number 4589, in GWR green, also a British Railways black-liveried version, running number 5574. Bachmann Branchline have for many years made various versions of the 4575 Class.

References edit

^ Champ (2018), p. 319.
^ ^a ^b le Fleming (1962), pp. J46–J50.
^ Allcock et al. (1968), p. 35.
^ "South Devon Railway 4588 page". Archived from the original on 20 September 2017. Retrieved 6 January 2014.
^ "Great Western Railway 4575 class 2-6-2T locomotive, 5521". Epping Ongar Railway. Retrieved 18 October 2021.
^ "The Flour Mill 5521 page".
^ "Llangollen Railway 5532 Page".
^ "The Flour Mill Projects page".
^ "Llangollen Railway 5539 Page". Archived from the original on 30 December 2019. Retrieved 6 January 2014.
^ "Dean Forest Locomotive Group 5541 Page".
^ "5542 Web site".
^ "Bodmin and Wenford Stock List - 5552". Archived from the original on 9 April 2019. Retrieved 6 January 2014.
^ "5572 - 2-6-2T".

Allcock, N. J.; Davies, F. K.; le Fleming, H. M.; Maskelyne, J. N.; Reed, P. J. T.; Tabor, F. J. (1968) [1951]. White, D. E. (ed.). The Locomotives of the Great Western Railway, part one: Preliminary Survey. Kenilworth: RCTS.
Champ, Jim (2018). An Introduction to Great Western Locomotive Development. Barnsley: Pen & Sword Transport. ISBN 978-1-4738-7784-9. OCLC 1029234106. OL 26953051M.
le Fleming, H.M. (February 1962). White, D.E. (ed.). The Locomotives of the Great Western Railway, part nine: Standard Two-Cylinder Classes. RCTS.
Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. pp. 40–41, 50, 102, 137. ISBN 978-0-9028-8821-0. OCLC 815661.