BR Standard Class 4 4-6-0

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BR Standard Class 4 4-6-0
75027HK.JPG
Preserved Standard Class 4 4-6-0 No. 75027 on the Bluebell Railway
Type and origin
Power type Steam
Designer R. A. Riddles
Builder BR Swindon Works
Build date May 1951 – May 1957
Total produced 80
Specifications
Configuration 4-6-0
UIC class 2′C h2
Gauge 4 ft 8 12 in (1,435 mm)
Leading dia. 3 ft 0 in (0.914 m)
Driver dia. 5 ft 8 in (1.727 m)
Length 60 ft 0 in (18.29 m)
Width 8 ft 9 12 in (2.68 m)
Height 13 ft 0 in (3.96 m)
Axle load 17.25 long tons (17.53 t; 19.32 short tons)
Adhesive weight 51.55 long tons (52.38 t; 57.74 short tons)
Loco weight 67.90 long tons (68.99 t; 76.05 short tons)
Tender weight BR1B: 49.15 long tons (49.94 t);
BR2/BR2A: 42.15 long tons (42.83 t)
Tender type BR1B (15), BR2 (50), BR2A (15)
Fuel type Coal
Fuel capacity BR1B: 7.00 long tons (7.11 t; 7.84 short tons);
BR2/BR2A: 6.00 long tons (6.10 t; 6.72 short tons)
Water cap BR1B: 4,725 imp gal (21,480 l; 5,674 US gal);
BR2/BR2A: 3,500 imp gal (16,000 l; 4,200 US gal)
Firebox:
 • Firegrate area
26.7 sq ft (2.48 m2)
Boiler BR4
Boiler pressure 225 psi (1.55 MPa)
Heating surface:
 • Tubes and flues
1,301 sq ft (120.9 m2)
 • Firebox 143 sq ft (13.3 m2)
Superheater:
 • Heating area 258 sq ft (24.0 m2)
Cylinders Two, outside
Cylinder size 18 in × 28 in (457 mm × 711 mm)
Performance figures
Tractive effort 25,515 lbf (113.5 kN)
Factor of adh. 4.52
Career
Operators British Railways
Power class 4MT
Numbers 75000–75079
Axle load class BR1B: Route Availability 7
BR2/BR2A: Route Availability 4
Withdrawn October 1964 – August 1968
Disposition 6 preserved, remainder scrapped

The British Railways Standard Class 4 4-6-0 is a class of steam locomotives, 80 of which were built during the 1950s. Six have been preserved.

Background[edit]

The class was introduced in 1951. They were designed for mixed traffic use on secondary routes where the otherwise ubiquitous BR standard class 5 and their predecessors, the Black Fives, would be too heavy. They were essentially a tender version of the standard 4 2-6-4T, with similar characteristics to the GWR Manor Class, though unlike the Manors they were built to the universal loading gauge. They used the same running gear as the tank engine (with the leading bogie from the Standard Class 5), and substantially the same firebox, smokebox and boiler, although the boiler barrel was increased in length by 9 inches (229 mm).[1]

Design work was done at Brighton by R. A. Riddles, with help from Swindon, Derby and Doncaster. Construction was at the BR Swindon Works.

The engine weighed 67.90 long tons (68.99 t; 76.05 short tons), was 60 ft 0 in (18.29 m) long, with 5 ft 8 in (1.727 m) diameter driving wheels. It had two cylinders of 18 inches (457 mm) diameter and 28 inches (711 mm) stroke operated at maximum boiler pressure of 225 lbf/in2 (1.55 MPa), to produce 25,515 lbf (113.5 kN) tractive effort. Its British Railways power classification was 4MT.

It normally used the standard BR2 or BR2A tender, which weighed 42.15 long tons (42.83 t; 47.21 short tons) and carried 3,500 imp gal (16,000 l; 4,200 US gal) of water and 6.00 long tons (6.10 t; 6.72 short tons) of coal. In this configuration its route availability was 4, almost universal over the British Railways network.

In service[edit]

75073 at Bath Green Park shed in the mid-1960s

The class was initially allocated to the London Midland Region (45) and the Western Region (20). The last 15 were allocated to the Southern Region. The Southern batch were built with BR1B tenders, which weighed 49.15 long tons (49.94 t; 55.05 short tons), and carried 4,725 imp gal (21,480 l; 5,674 US gal) of water and 7.00 long tons (7.11 t; 7.84 short tons) of coal. This reduced their route availability to 7, the same as the Standard Class 5.

Table of withdrawals
Year Quantity in
service at
start of year
Quantity
withdrawn
Locomotive numbers Notes
1964 80 2 75001/67
1965 78 11 75000/03/05/07–08/22/25/28/38/72–73
1966 67 20 75011/14/23/31/36/44–45/49–51/53–54/56–57/63/65–66/69–70/79
1967 47 37 75002/04/06/10/12–13/15–18/24/26/29–30/33/35/37/39–40/42–43/46–47/52/55/58–61/64/68/71/74–78
1968 10 10 75009/19–21/27/32/34/41/48/62

Preservation[edit]

Number & Name Tender Attached Built Withdrawn Service life Location Livery Status Image
75014 "Braveheart" BR2A Nov 1951 Dec 1966 15 years, 30 days Dartmouth Steam Railway BR Lined Black, Early Emblem Operational, boiler ticket expires in 2026. Railway Overbridge near Kingswear - geograph.org.uk - 13635.jpg
75027 BR2A May 1954 Aug 1968 14 years, 3 months Bluebell Railway BR Lined Green, Late Crest Awaiting overhaul, recently received some cosmetic attention. 75027 Bluebell railway.jpg
75029 "The Green Knight" BR2A May 1954 Aug 1967 13 years, 3 months North Yorkshire Moors Railway BR Lined Green, Late Crest Awaiting boiler work, due to cracks in the firebox. 75029 at Grosmont (1).jpg
75069 BR1B Sept 1955 Sept 1966 11 years Severn Valley Railway *BR Lined Black, Late Crest Undergoing overhaul with major work required on the boiler. Standard class 4MT 75069 at Hastings, Ashford 150.jpg
75078 BR1B Jan 1956 Jul 1966 10 years, 5 months Keighley and Worth Valley Railway BR Lined Black, Late Crest Operational, boiler ticket expires in 2024. Keighley and Worth Valley Railway near Haworth - geograph.org.uk - 624800.jpg
75079 N/A Jan 1956 Nov 1966 10 years, 10 months Mid-Hants Railway - Undergoing restoration.

All but 75079 have worked in preservation at some point. None of the class are presently mainline approved but three of them (75014, 75029 and 75069) have worked on the main line. Two members of the class (75014 and 75078) are presently operational with 75014 returning to service in December 2016. 75029 was passed to work on the main line between Grosmont and Whitby with occasional visits to Battersby during galas.

Modelling[edit]

Bachmann and Hornby have both recently released models of these engines in 00 gauge.

References[edit]

  1. ^ Casserley, H.C. (1960). The Observer's Book of Railway Locomotives of Britain. London: Frederick Warne & Co. Ltd. p. 226. 

External links[edit]