NER Class Y

NER Class Y
LNER Class A7

No. 9772 at Hull Dairycoates Locomotive Depot 1947

Type and origin
Power type	Steam
Designer	Wilson Worsdell
Builder	Darlington Works
Build date	October 1910 – June 1911
Total produced	20

Specifications
Configuration:
• Whyte	4-6-2T
• UIC	2′C1′ n3t, later 2′C1′ h3t
Gauge	4 ft 8 ¹⁄₂ in (1,435 mm)
Leading dia.	3 ft 1 ¹⁄₄ in (0.946 m)
Coupled dia.	4 ft 7 ¹⁄₄ in (1.403 m)
Trailing dia.	3 ft 9 ¹⁄₄ in (1.149 m)
Wheelbase	34 ft 3 in (10.439 m)
Length	43 ft 10 in (13.360 m)
Axle load	19.50 long tons (19.81 t; 21.84 short tons)
Adhesive weight	55.50 long tons (56.39 t; 62.16 short tons)
Loco weight	87.50 long tons (88.90 t; 98.00 short tons)
Fuel type	Coal
Fuel capacity	5.00 long tons (5.08 t; 5.60 short tons)
Water cap	2,300 imp gal (10,000 l; 2,800 US gal)
Boiler pressure	160 to 180 lbf/in² (1.1 to 1.2 MPa)
Cylinders	Three
Cylinder size	16 ¹⁄₂ in × 26 in (419 mm × 660 mm)
Valve gear	Stephenson
Valve type	7 ¹⁄₂-inch (191 mm) piston valves

Performance figures
Tractive effort	26,140 to 29,405 lbf (116.28 to 130.80 kN)

Career
Operators	North Eastern Railway London and North Eastern Railway British Railways
Power class	BR: 5F, 3F from May 1953
Axle load class	LNER/BR: Route availability: 7
Disposition	All scrapped

The North Eastern Railway (NER) Class Y (LNER Class A7) 4-6-2T tank locomotives were designed whilst Wilson Worsdell was Chief Mechanical Engineer, but none were built until 1910 by which time Vincent Raven had taken over.

Overview

The Class Y locomotives were intended for hauling coal trains and were developed from the NER Class X (LNER Class T1) 4-8-0T heavy shunters. However, they had larger boilers and smaller cylinders for higher working speeds. Twenty were built in one batch and numbered between 1113 and 1195. Originally built with saturated boilers pressed to 175 lbf/in² (1.21 MPa), seven locomotives were later fitted with boilers equipped with superheaters and pressed to 160 lbf/in² (1.10 MPa).^[1]

All twenty locomotives passed to the London and North Eastern Railway at the 1923 Grouping. The LNER left the NER's locomotive numbers unchanged, but raised the boiler pressure of the saturated locomotives to 180 lbf/in² (1.2 MPa). They also fitted ten more locomotives with the 160 lbf/in² superheated boilers that the LNER classified as diagram 55.

By the time the A7s entered LNER ownership in 1923, the A7s had been relegated to shunting in the larger marshalling yards. Their power was invaluable when shunting heavy trains over the shunting hump. In the 1930s, Nos. 1136 and 1175 were allocated to hauling chalk quarry trains from Hessle Quarry to Stoneferry Cement Works, in the Hull area.

Heavy mineral traffic declined after the end of World War II, and the A7s moved to the Hull area, except for Nos. 1181 and 1192 which stayed at Stockton. At Hull, the A7s replaced the old Hull and Barnsley Railway (H&BR) types which were being withdrawn at that time.

During LNER ownership in the 1940s, two locomotives were rebuilt with diagram 63B superheated boilers pressed to 175 lbf/in²; the locomotives were then assigned to Class A7/1.

In the LNER 1946 renumbering scheme, the class received the 9770 to 9789 block; at nationalisation in 1948 all 20 locomotives passed to British Railways they were assigned the numbers 69770–69789, although the last locomotive was withdrawn before it was renumbered.

BR continued the rebuilding scheme, dealing with another 13 locomotives, although one received a diagram 63B saturated boiler and one a diagram 63C superheated one. Both were pressed to 175 lbf/in².

Withdrawal

The A7s were withdrawn between 1951 and 1957 and none have survived into preservation.

Table of locomotives^[2]
NER No.	LNER 1942 No.	Date built	Date superheated	Date rebuilt	Date Withdrawn	Notes
1113	9770	000000001910-10-01-0000Oct 1910	000000001922-05-01-0000May 1922	000000001950-07-01-0000Jul 1950	000000001954-10-01-0000Oct 1954
1114	9771	000000001910-11-01-0000Nov 1910	000000001924-09-01-0000Sep 1924	000000001948-06-01-0000Jun 1948	000000001954-11-01-0000Nov 1954
1126	9772	000000001910-11-01-0000Nov 1910	000000001917-07-01-0000Jul 1917	—	000000001957-12-01-0000Dec 1957
1129	9773	000000001910-12-01-0000Dec 1910	000000001930-10-01-0000Oct 1930	000000001951-07-01-0000Jul 1951	000000001955-03-01-0000Mar 1955
1136	9774	000000001910-12-01-0000Dec 1910	000000001932-05-01-0000May 1932	000000001950-05-01-0000May 1950	000000001954-08-01-0000Aug 1954
1170	9775	000000001910-12-01-0000Dec 1910	—	000000001945-11-01-0000Nov 1945	000000001952-04-01-0000Apr 1952
1174	9776	000000001911-01-01-0000Jan 1911	000000001930-01-01-0000Jan 1930	000000001952-01-01-0000Jan 1952	000000001954-06-01-0000Jun 1954
1175	9777	000000001911-01-01-0000Jan 1911	000000001919-05-01-0000May 1919	—	000000001952-05-01-0000May 1952
1176	9778	000000001911-02-01-0000Feb 1911	—	—	000000001955-05-01-0000May 1955
1179	9779	000000001911-02-01-0000Feb 1911	000000001929-02-01-0000Feb 1929	000000001949-12-01-0000Dec 1949	000000001954-11-01-0000Nov 1954
1180	9780	000000001911-02-01-0000Feb 1911	000000001930-12-01-0000Dec 1930	000000001950-01-01-0000Jan 1950	000000001954-11-01-0000Nov 1954
1181	9781	000000001911-03-01-0000Mar 1911	000000001929-03-01-0000Mar 1929	000000001951-04-01-0000Apr 1951	000000001956-11-01-0000Nov 1956
1182	9782	000000001911-03-01-0000Mar 1911	000000001923-03-01-0000Mar 1923	—	000000001957-12-01-0000Dec 1957
1183	9783	000000001911-03-01-0000Mar 1911	000000001928-11-01-0000Nov 1928	000000001948-04-01-0000Apr 1948	000000001956-12-01-0000Dec 1956
1185	9784	000000001911-04-01-0000Apr 1911	000000001922-03-01-0000Mar 1922	000000001948-05-01-0000May 1948	000000001956-03-01-0000Mar 1956
1190	9785	000000001911-04-01-0000Apr 1911	000000001918-11-01-0000Nov 1918	000000001943-09-01-0000Sep 1943	000000001955-11-01-0000Nov 1955
1191	9786	000000001911-05-01-0000May 1911	000000001930-04-01-0000Apr 1930	000000001948-04-01-0000Apr 1948	000000001957-12-01-0000Dec 1957	Rebuilt with superheated dia 63C boiler
1192	9787	000000001911-05-01-0000May 1911	—	000000001951-08-01-0000Aug 1951	000000001954-08-01-0000Aug 1954	Rebuilt with saturated dia 63B boiler
1193	9788	000000001911-05-01-0000May 1911	000000001920-09-01-0000Sep 1920	000000001948-07-01-0000Jul 1948	000000001955-11-01-0000Nov 1955
1195	9789	000000001911-06-01-0000Jun 1911	000000001922-11-01-0000Nov 1922	—	000000001951-05-01-0000May 1951	Withdrawn before BR number applied

References

↑ Fry 1964, p. 17.
↑ Fry 1964, p. 19.

Fry, E. V., ed. (April 1964). Locomotives of the L.N.E.R., part 7: Tank Engines - Classes A5 to H2. Kenilworth: RCTS. ISBN 0-901115-13-4.
Ian Allan ABC of British Railways Locomotives, part 4 (1948 ed.). p. 55.

External links

LNER Encyclopedia

London and North Eastern Railway locomotives

Pre-grouping
railway designs

Great Central	A5 B1/B18 B2/B19 B3 B4 B5 B6 B7 B8 B9 C4 C5 C13 C14 D5 D6 D7 D8 D9 D10 D11 D12 E2 E3 E8 F1 F2 G3 J8 J9 J10 J11 J12 J13 J58 J59 J60 J61 J62 J63 L1/L3 M1 N4 N5 N6 O4 O5 Q4 S1 X4 Y2
Great Eastern	B12 D13 D14 D15 D16 E4 F3 F4 F5 F6 F7 G4 J14 J15 J16 J17 J18 J19 J20 J65 J66 J67 J68 J69 J70 N7 Y4 Y5 Y6 Z4/J92
Great North of Scotland	D38 D39 D40 D41 D42 D43 D44 D45 D46 D47 D48 G10 J90 J91 Z4 Z5
Great Northern	A1 C1 C2 C12 D1 D2 D3 D4 E1 G1 G2 J1 J2 J3 J4 J5 J6 J7 J50 J51 J52 J53 J54 J55 J56 J57 K1 K2 K3 N1 N2 O1 O2 Q1 Q2 Q3 R1
North British	C10 C11 C15 C16 D25 D26 D27 D28 D29 D30 D31 D32 D33 D34 D35 D36 D50 D51 E7 G7 G8 G9 J31 J32 J33 J34 J35 J36 J37 J81 J82 J83 J84 J85 J86 J88 N14 N15 Y9 Y10
North Eastern	A2 A6 A7 B13 B14 B15 B16 C6 C7 C8 D17/1 D17/2 D18 D19 D20 D21 D22 D23 E5 E6 F8 G5 G6 H1 J21 J22 J24 J25 J26 J27 J71 J72 J73 J74 J76 J77 J78 J79 N8 N9 N10 Q5 Q6 Q7 T1 X1 X2 X3 Y7 Y8 EB1 EE1 EF1 ES1
North Eastern (ex Hull & Barnsley)	D24 J23 J28 J75 J80 N11 N12 N13 Q10

LNER designs

Gresley (1923–1941)	A1 A3 A4 A8 B17 D49 J38 J39 J50 K4 P1 P2 U1 V1 V2 V3 V4 W1 EM1
Thompson (1941–1946)	A1 A2/1 A2/2 A2/3 B1 B2 K1 K5 L1 O1 Q1
Peppercorn (1946–1947)	A1 A2 K1

Other designs

Proposed designs

P10 2-8-2T (Nov 1929)
B 4-6-0 (Nov 1936)
? 4-8-2 (1939)
Q 0-8-0 (June 1930)
D 4-4-0 (1943)
? 4-8-4 (Feb 1946)
? 4-8-2 (Feb 1946)
K 2-6-0 (Aug 1947)

see also: British Railways steam locomotives; GWR locomotives; LMS locomotives; Southern Railway locomotives

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