SECR D class

Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B n2
Gauge	4 ft 8 1⁄2 in (1,435 mm)
Leading dia.	3 ft 7 in (1.092 m)
Driver dia.	6 ft 8 in (2.032 m)
Loco weight	50 long tons 0 cwt (112,000 lb or 50.8 t)
Tender weight	38 long tons 5 cwt (85,700 lb or 38.9 t)
Fuel type	Coal
Water cap	3,300 imp gal (15,000 l; 4,000 US gal)
Firebox:; • Firegrate area	20 1⁄4 sq ft (1.88 m2)
Boiler pressure	175 lbf/in2 (1.21 MPa)
Heating surface	1,505 sq ft (139.8 m2)
• Tubes	1,381 sq ft (128.3 m2)
• Firebox	124 sq ft (11.5 m2)
Cylinders	Two, inside
Cylinder size	19 in × 26 in (483 mm × 660 mm)

Type and origin
Power type	Steam
Designer	Harry Wainwright
Builder	Ashford Works (21); Dübs & Co. (10); Sharp, Stewart & Co. (10); Robert Stephenson & Co. (5); Vulcan Foundry (5);
Build date	1901–1907
Total produced	51

SECR D class
	The only preserved example seen in the great hall of the National Railway Museum
Type and origin
Power type	Steam
Designer	Harry Wainwright
Builder	Ashford Works (21); Dübs & Co. (10); Sharp, Stewart & Co. (10); Robert Stephenson & Co. (5); Vulcan Foundry (5);
Build date	1901–1907
Total produced	51
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B n2
Gauge	4 ft 8 1⁄2 in (1,435 mm)
Leading dia.	3 ft 7 in (1.092 m)
Driver dia.	6 ft 8 in (2.032 m)
Loco weight	50 long tons 0 cwt (112,000 lb or 50.8 t)
Tender weight	38 long tons 5 cwt (85,700 lb or 38.9 t)
Fuel type	Coal
Water cap	3,300 imp gal (15,000 l; 4,000 US gal)
Firebox:; • Firegrate area	20 1⁄4 sq ft (1.88 m2)
Boiler pressure	175 lbf/in2 (1.21 MPa)
Heating surface	1,505 sq ft (139.8 m2)
• Tubes	1,381 sq ft (128.3 m2)
• Firebox	124 sq ft (11.5 m2)
Cylinders	Two, inside
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Performance figures
Tractive effort	17,450 lbf (77.62 kN)
Career
Operators	South Eastern and Chatham Railway; → Southern Railway; → British Railways;
Class	D
Power class	D: 1P; D1: 2P;
Locale	Southern Region
Withdrawn	D: 1944–1956; D1:1944–1961;
Disposition	21 rebuilt to D1 class (1921–25); one preserved; remainder scrapped

The SECR D class is a class of 4-4-0 tender locomotives designed by Harry Wainwright for the South Eastern and Chatham Railway.

Overview

The construction of the initial 20 engines was shared between Ashford railway works and the Glasgow builder, Sharp, Stewart and Company. The first of the class to enter service, in 1901, was a Glasgow product and by 1907 fifty-one were in traffic. Of these twenty-one were Ashford built while the rest were supplied by outside contractors. The D class was a Harry Wainwright design and he was responsible for the overall look of the engine. The detail work was undertaken by Robert Surtees, his chief draughtsman at Ashford works. Underneath the flowing curves and symmetry of the exterior lay a sure-footed machine that responded well to hard work.

D1 class

D1 31470 at Tonbridge 1958

In 1913 Richard Maunsell started the rebuilding of 21 D Class locomotives with Belpaire fireboxes to produce the more powerful D1 class. These bigger engines were needed to cope with increasing loads on the Kent Coast Line through Chatham.

Operation

Initially the D class was put to work on the Kent coast and Hastings services out of London. By the 1930s the largest allocation of D class 4-4-0s was at Gillingham depot in Kent but they had by now been reduced to secondary train duties and were now carrying the livery of the Southern Railway. At the outbreak of World War II in 1939 some of the D class were placed into storage. Then in 1941 others were transferred to Nine Elms depot. A handful were based at Redhill on the Reading-Tonbridge cross-country line.

In 1948 British Railways inherited 28 of the Wainwright 4-4-0s. Their final years saw them concentrated at Guildford in Surrey and the last of the D class, No.31075, was withdrawn from there in 1956.

Table of withdrawals[1]
Year	Quantity in service at start of year	Quantity withdrawn	Locomotive numbers	Notes
1944	51	2	1742/47	1742 D class, 1747 D1 class
1947	49	1	1726	D class
1950	48	2	31736/38	31738 D class; 31736 D1 class
1951	46	11	31057/92, 31477/90, 31502, 31730–32/40/45/48	31502 and 31745 D1 class, remainder D class
1953	35	5	31501, 31728/33/44/50	All D class
1954	30	3	31493, 31729/46	All D class
1955	27	4	31496, 31586/91, 31734	All D class
1956	23	6	31075, 31488, 31549/74/77, 31737	All D class
1959	17	2	31470, 31741	Both D1 class
1960	15	5	31492/94, 51509, 31743/49	All D1 class
1961	10	10	31145, 31246/47, 31487/89, 31505/45, 31727/35/39	All D1 class

Preservation

One engine, No.31737, has been preserved and is in its original livery – that of the South Eastern & Chatham Railway – at the National Railway Museum in York.

References

Bradley 1980, pp. 22, 112–113.

Herring, Peter (2000) Classic British Steam Locomotives, Enderby: Abbeydale, ISBN 1-86147-057-6
Bradley, D. L. (1980). The locomotive history of the South Eastern and Chatham Railway. Railway Correspondence and Travel Society. ISBN 0-901115 49 5.CS1 maint: ref=harv (link)

External links

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[FOOTNOTEBradley198022,_112–113-1] Bradley 1980, pp. 22, 112–113.