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Specifications
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2'Bn2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	3 ft 7+1⁄4 in (1,099 mm)
Driver dia.	7 ft 1+1⁄4 in (2,165 mm)
Wheelbase	23 ft 6 in (7.16 m) Class M1/Q engine ; 23 ft 9 in (7.24 m) Class Q1 engine ; 12 ft 8 in (3.86 m) tender ; 45 ft 8+1⁄4 in (13.926 m) Class M1/Q total ; 46 ft 2+3⁄4 in (14.091 m) Class Q1 total
Length	Q1 17.145 m (56.25 ft)
Axle load	M1: 18.6 long tons (18.9 t); Q: 18.8 long tons (19.1 t); Q1: 19.2 long tons (19.5 t)
Loco weight	52.5 long tons (53.3 t) (Class M1) ; 50.3 long tons (51.1 t) (Class Q) ; 53.5 long tons (54.4 t) (Class Q1)
Tender weight	41.2 long tons (41.9 t)
Total weight	93.7 long tons (95.2 t) (Class M1) ; 91.5 long tons (93.0 t) (Class Q) ; 94.7 long tons (96.2 t) (Class Q1)
Fuel type	Coal
Water cap.	4,125 imp gal (18,750 L; 4,954 US gal)
Firebox:
• Grate area	19.8 sq ft (1.84 m2)
Boiler	4 ft 4 in (1.32 m) diameter
Boiler pressure	160 psi (1.10 MPa)
Heating surface:
• Firebox	123 sq ft (11.4 m2)
• Tubes	479 sq ft (44.5 m2)
• Flues	291 sq ft (27.0 m2)
• Total surface	1,097 sq ft (101.9 m2)
Superheater:;
• Heating area	204 sq ft (19.0 m2)
Cylinders	Two, inside
Cylinder size	19 in × 26 in (483 mm × 660 mm) ; 20 in × 26 in (508 mm × 660 mm) (No. 1870)
Valve gear	Stephenson

Type and origin
Type and origin
Power type	Steam
Designer	Wilson Worsdell
Builder	NER Gateshead
Build date	1892-1894 (Class M1) ; 1896-1897 (Class Q) ; 1896 (Class Q1)
Total produced	20 (Class M1) ; 30 (Class Q) ; 2 (Class Q1)

NER Class M1/M, Q and Q1
LNER Class D17/1, D17/2 and D18
NER Class M1/M, Q and Q1 ; LNER Class D17/1, D17/2 and D18
	Preserved M1 No. 1621 in the National Railway Museum, York, September 2010
Power type
Type and origin
Power type	Steam
Designer	Wilson Worsdell
Builder	NER Gateshead
Build date	1892-1894 (Class M1) ; 1896-1897 (Class Q) ; 1896 (Class Q1)
Total produced	20 (Class M1) ; 30 (Class Q) ; 2 (Class Q1)
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2'Bn2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	3 ft 7+1⁄4 in (1,099 mm)
Driver dia.	7 ft 1+1⁄4 in (2,165 mm)
Wheelbase	23 ft 6 in (7.16 m) Class M1/Q engine ; 23 ft 9 in (7.24 m) Class Q1 engine ; 12 ft 8 in (3.86 m) tender ; 45 ft 8+1⁄4 in (13.926 m) Class M1/Q total ; 46 ft 2+3⁄4 in (14.091 m) Class Q1 total
Length	Q1 17.145 m (56.25 ft)
Axle load	M1: 18.6 long tons (18.9 t); Q: 18.8 long tons (19.1 t); Q1: 19.2 long tons (19.5 t)
Loco weight	52.5 long tons (53.3 t) (Class M1) ; 50.3 long tons (51.1 t) (Class Q) ; 53.5 long tons (54.4 t) (Class Q1)
Tender weight	41.2 long tons (41.9 t)
Total weight	93.7 long tons (95.2 t) (Class M1) ; 91.5 long tons (93.0 t) (Class Q) ; 94.7 long tons (96.2 t) (Class Q1)
Fuel type	Coal
Water cap.	4,125 imp gal (18,750 L; 4,954 US gal)
Firebox:
• Grate area	19.8 sq ft (1.84 m2)
Boiler	4 ft 4 in (1.32 m) diameter
Boiler pressure	160 psi (1.10 MPa)
Heating surface:
• Firebox	123 sq ft (11.4 m2)
• Tubes	479 sq ft (44.5 m2)
• Flues	291 sq ft (27.0 m2)
• Total surface	1,097 sq ft (101.9 m2)
Superheater:;
• Heating area	204 sq ft (19.0 m2)
Cylinders	Two, inside
Cylinder size	19 in × 26 in (483 mm × 660 mm) ; 20 in × 26 in (508 mm × 660 mm) (No. 1870)
Valve gear	Stephenson
Tractive effort
Performance figures
Tractive effort	14,974 lbf (66.61 kN) (Class M1/Q) ; 13,990 lbf (62.23 kN) (No. 1869) ; 15,500 lbf (69 kN) (No. 1870)
Operators
Career
Operators	North Eastern Railway, London & North Eastern Railway, British Rail
Withdrawn	1931–1945 (Class M1); 1931–1948 (Class Q) ; 1930 (Class Q1)
Disposition	One M1 preserved (No. 1621); remainder M1, Q & Q1 scrapped

The North Eastern Railway Class M1 (LNER Class D17/1) is a class of 4-4-0 steam locomotive, designed by Wilson Worsdell. 20 initial engines were built, then 30 further units were built, designated Class Q (LNER Class D17/2).

Classification

Classification was complex. The NER initially classified these locomotives "M1", while a variant (with compound expansion) was classified "M". The compound was later re-classified "3CC" and the "M1" was re-classified "M".

Under LNER ownership the "M" (formerly "M1") became LNER Class D17/1 and the "3CC" (formerly "M") became LNER Class D19.

This table summarises LNER classes D17, D18 and D19, which were all very similar:

Original NER class	New NER class	LNER Class	Cylinders	Driving wheels
M1	M	D17/1	(2) 19″ × 26″	7′ 1¼″
Q	-	D17/2	(2) 19½″ × 26″	7′ 1¼″
Q1	-	D18	(2) 19½″ × 26″	7′ 7¼″
M	3CC	D19	HP (1) 19″ × 26″ LP (2) 20″ × 24″	7′ 1¼″

HP = high-pressure cylinder, LP = low-pressure cylinders

Accidents and incidents

On 4 October 1894, locomotive No. 1622 was one of two locomotives hauling a sleeping car train which overran signals and collided with a freight train that was being shunted at Castle Hills, Yorkshire. One person was killed.^[1]

On 14 February 1927, locomotive No. 1628 was hauling a passenger train that was in a head-on collision with another at Hull Paragon station, Yorkshire due to a signalman's error. Twelve people were killed and 24 were injured.^[2]

Withdrawal

The last two D17/1s were withdrawn in 1945. Number 1629 was scrapped but number 1621 was saved for preservation.

No D17/1s passed into British Railways ownership. Two D17/2s did (BR numbers 62111 and 62112) but they were withdrawn in February 1948.

Preservation

D17/1 number 1621 is preserved at the National Railway Museum. It is at the National Railway Museum in Shildon.^{[citation needed]}

References

^ Hoole, Ken (1983). Trains in Trouble: Vol. 4. Truro: Atlantic Books. p. 19. ISBN 0-906899-07-9.
^ Gerard, Malcolm; Hamilton, J. A. B. (1981) [1967]. Trains to Nowhere. London: Georg Allen & Unwin. pp. 37–40. ISBN 0-04-385084-7.