NER Class M1

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)Wheelbase23 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 totalLengthQ1 17.145 m (56.25 ft)Axle loadM1: 18.6 long tons (18.9 t)
Q: 18.8 long tons (19.1 t)
Q1: 19.2 long tons (19.5 t)Loco weight52.5 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 weight41.2 long tons (41.9 t)Total weight93.7 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 typeCoalWater cap.4,125 imp gal (18,750 L; 4,954 US gal)Firebox:​ • Grate area19.8 sq ft (1.84 m²)Boiler4 ft 4 in (1.32 m) diameterBoiler pressure160 psi (1.10 MPa)Heating surface:​ • Firebox123 sq ft (11.4 m²) • Tubes479 sq ft (44.5 m²) • Flues291 sq ft (27.0 m²) • Total surface1,097 sq ft (101.9 m²)Superheater:
​ • Heating area204 sq ft (19.0 m²)CylindersTwo, insideCylinder size19 in × 26 in (483 mm × 660 mm)
20 in × 26 in (508 mm × 660 mm) (No. 1870)Valve gearStephenson

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)

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Withdrawn	1931–1945 (Class M1) 1931–1948 (Class Q) 1930 (Class Q1)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

External links

• LNER Encyclopedia