BNCR Class A

The Belfast and Northern Counties Railway (BNCR) Class A was a class of 13 two-cylinder compound steam locomotives built for service in north-east Ireland. The first two members of the class would be the last locomotives to be built for the independent BNCR, being completed before its purchase by the Midland Railway in 1903. The members of the class were rebuilt by the LMS (NCC) becoming either Class A1 or Class U2 depending on how they had been modified.

BNCR Class A
Type and origin
Power typeSteam
BuilderBNCR/NCC, York Road Works, Belfast
Midland Railway, Derby Works
Build date1901–1908
Total produced13
RebuilderLMS (NCC)
Rebuild date1927–1936
Specifications
Configuration:
​
 • Whyte4-4-0
Gauge5 ft 3 in (1,600 mm)
Leading dia.3 ft 0 in (0.914 m)
Driver dia.6 ft 0 in (1.829 m)
Wheelbase40 ft 11 in (12.47 m)
Length49 ft 7+3⁄4 in (15.13 m)
Width8 ft 4 in (2.54 m)
Height13 ft 2 in (4.01 m)
Axle load15.30 long tons (15.55 t; 17.14 short tons)+
14.45 long tons (14.68 t; 16.18 short tons)
Adhesive weight29.75 long tons (30.23 t; 33.32 short tons)
Loco weight45.05 long tons (45.77 t; 50.46 short tons)
Tender weight28.85 long tons (29.31 t; 32.31 short tons)
Fuel typeCoal
Fuel capacity6.00 long tons (6.10 t; 6.72 short tons)
Water cap.2,090 imp gal (9,500 L; 2,510 US gal)
Boiler pressure175 psi (1.21 MPa)
Heating surface930 sq ft (86 m2)
 • Tubes824 sq ft (76.6 m2)
 • Firebox106 sq ft (9.8 m2)
CylindersTwo
High-pressure cylinderLHS: 18 in × 24 in (457 mm × 610 mm)
Low-pressure cylinderRHS: 26 in × 24 in (660 mm × 610 mm)
Valve gearWalschaerts
Train brakesAutomatic vacuum
Performance figures
Tractive effort16,065 lbf (71.5 kN)
Factor of adh.4.15
Career
Operators
Scrapped1947–1954

History

The BNCR had standardised on locomotives with a 2-4-0 wheel arrangement for its passenger locomotives during the 1870s and construction continued through to the mid-1890s. However, with increasing loads and heavier trains the limitations of this wheel arrangement became apparent. The first purpose-built 4-4-0s, the Class B "Light Compounds", had been in introduced in 1897 but something more powerful was needed to supplement the two Class D "Heavy Compounds" that were rebuilt to 4-4-0s at the same time.

The Class A locomotives were designed by the BNCR Locomotive Engineer Bowman Malcolm and were the last design of broad gauge locomotives to be built for the independent Belfast and Northern Counties Railway, the first two being completed before its purchase by the Midland Railway in 1903.

The first Class A Engine was No.34 which was outshopped from York Road in April 1901 and named Queen Alexandra. The second of the class, which had the distinction of being the last locomotive to be built by the BNCR, was No.3, King Edward VII, which was completed fifteen months later in July 1902. Building continued over a seven-year period after the take-over of the company by the Midland Railway. Six locomotives were constructed at the Midland Railway's Derby Works and the remainder at York Road works.

The locomotives were built as two-cylinder compounds using the Worsdell-von Borries system, having an 18-inch (457 mm) high-pressure cylinder and a 26-inch (660 mm) diameter low-pressure cylinder, each with 24-inch (610 mm) stroke. Inside Walschaerts valve gear was fitted which was standard on the BNCR. The driving wheels were of 6 ft (1.829 m) diameter. The only visible difference between the two builders was the number of spokes on the bogie wheels, the Belfast-built batch had nine spokes while those built at Derby had ten.

Two main, and visibly obvious, changes were made to the locomotives when in traffic, viz: the fitting of Manson automatic tablet exchange apparatus for working single lines, and a rearwards projecting extension of the cab roof, offering more protection for the crew.

The Class A engines were coupled to what was known as the "Standard" tender which could carry 6 long tons (6.1 t; 6.7 short tons) of coal and 2,090 imperial gallons (9,500 L; 2,510 US gal) of water.

Five members of the class were renumbered between 1924 and 1927 when Nos. 3, 4, 5, 9 and 17 became Nos. 33, 62, 59, 69 and 58 respectively.

Rebuilding

Following the end of World War I the state of the locomotives operating in Northern Ireland was well below that which was needed to run the services effectively; much needed replacing but, however, cost was a major factor. It was decided to implement a "Renewal Programme" in which, not only new locomotives would be built but suitable classes of locomotives would be rebuilt, in the main following the style of the Midland and LMS railways. As part of this "Renewal Programme" all members of Class A were rebuilt between 1928 and 1936.

Dependent upon the modifications carried out, they were reclassified as either Class A1 or Class U2. Those classified as Class A1 were rebuilt with a Midland Railway type RG6 boiler and new cylinders of 18-by-24-inch (457 mm × 610 mm) diameter x stroke and retained some recognisable features. Those that were rebuilt as Class U2 underwent a more radical alteration and may have incorporated little of the original engines.

Details of the delivery, renumbering and rebuilding of the class are shown in the table below:

No.BuilderDate NameRe-No./
Date		 RebuiltNew
No.		 New
Class		New Name Scrapped/
Sold		 Notes
34York RdApril 1901Queen AlexandraApril 1928A1KnocklaydOctober 1950†*
3York RdJuly 1902King Edward VII33 (1926)December 1928A1BinevanaghNovember 1949†
4York RdAugust 190362 (1924)July 1928A1SlemishAugust 1954
9York RdDecember 190469 (1925)June 1933A1Slieve BaneAugust 1954
20York RdMay 1905December 192984U2Lisanoure CastleDecember 1961
63DerbyMay 1905Queen AlexandraJanuary 193687U2Queen AlexandraAugust 1957*
64DerbyMay 1905August 1929A1TrostanAugust 1954
65DerbyMay 1905June 1929A1KnockaghOctober 1950
66DerbyMay 1905May 1930A1Ben MadiganAugust 1954
5York RdAugust 190659 (1925)September 193286U2March 1960
17York RdJanuary 190758 (1927)February 1934A1LurigethanAugust 1954‡
67DerbyJune 1908January 193485U2March 1960
68DerbyJune 1908December 1927A1Slieve Gallion November 1947
  • * The name Queen Alexandra was transferred from No.34 to No.63 in November 1932.
  • † Locomotives 34 and 3 were built by the BNCR prior to being taken over by the Midland Railway in 1903.
  • ‡ The name Lurigethan was allocated, but never carried.

Livery

The BNCR painted the locomotives "invisible green" (a very dark bronze green that looked almost black) with vermilion, light blue and yellow lining. The initials "BNCR" in block capitals were carried on the tender sides.

The livery remained the same under Midland Railway administration with the addition of the diamond shaped Midland Railway crest to the cab sides and the initials "NCC" in gold block capitals on the tender sides. Buffer beams were vermilion, and the smoke box was black.

References
  • Arnold, R.M. (1973). NCC Saga. Newton Abbot: David & Charles. ISBN 0-7153-5644-5.
  • Arnold, R.M. (1973). Supplement to NCC Saga. Whitehead: Railway Preservation Society of Ireland.
  • London Midland and Scottish Railway (Northern Counties Committee). Class A general arrangement drawing. Belfast: LMS (NCC).


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