NER Class M1

NER Class M1/M, Q and Q1 LNER Class D17/1, D17/2 and D18
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	4-4-0
Gauge	1,435 mm (4 ft 8 1⁄2 in)
Leading wheel diameter	3 ft 7 1⁄4 in (1.099 m)
Driver diameter	7 ft 1 1⁄4 in (2.165 m)
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
Axle load	18.6 long tons (18.9 t) (Class M1) 18.8 long tons (19.1 t) (Class Q) 19.2 long tons (19.5 t) (Class Q1)
Locomotive 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)
Locomotive & tender combined 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)
Boiler	4 ft 4 in (1.32 m) diameter
Boiler pressure	160 psi (1.1 MPa)
Firegrate area	19.8 sq ft (1.84 m2)
Heating surface: Tubes	479 sq ft (44.5 m2)
Heating surface: Flues	291 sq ft (27.0 m2)
Heating surface: Firebox	123 sq ft (11.4 m2)
Heating surface: Total	1,097 sq ft (101.9 m2)
Superheater area	204 sq ft (19.0 m2)
Cylinders	2 (inside)
Cylinder size	19 × 26 in (480 × 660 mm) 20 × 26 in (510 × 660 mm) (No. 1870)
Valve gear	Stephenson
Tractive effort	14,974 lbf (66.61 kN) (Class M1/Q) 13,990 lbf (62.2 kN) (No. 1869) 15,500 lbf (69 kN) (No. 1870)
Career	North Eastern Railway, London & North Eastern Railway, British Rail
Retired	1931-1945 (Class M1) 1931-1948 (Class Q) 1930 (Class Q1)
Disposition	1 preserved (No. 1621), 19 scrapped (Class M1) All scrapped (Class Q) Both scrapped (Class Q1)

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 is 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" x 26"	7' 1¼"
Q	-	D17/2	(2) 19½" x 26"	7' 1¼"
Q1	-	D18	(2) 19½" x 26"	7' 7¼"
M	3CC	D19	HP (1) 19" x 26" LP (2) 20" x 24"	7' 1¼"

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

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.

External links

• LNER Encyclopedia
• Photos of a model LNER Class D17

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