LMS Fowler Class 4F

Type and origin
Type and origin
Power type	Steam
Designer	Henry Fowler
Builder	LMS Derby Works (185); LMS Crewe Works (165); LMS St. Rollox Works (60); LMS Horwich Works (10); North British Locomotive Co. (80); Kerr, Stuart & Co. (50); Andrew Barclay Sons & Co. (25);
Build date	1924–1941
Total produced	575

LMS Fowler Class 4F
LMS Fowler Class 4F
	44444 at Stockport, 1950
Power type
Type and origin
Power type	Steam
Designer	Henry Fowler
Builder	LMS Derby Works (185); LMS Crewe Works (165); LMS St. Rollox Works (60); LMS Horwich Works (10); North British Locomotive Co. (80); Kerr, Stuart & Co. (50); Andrew Barclay Sons & Co. (25);
Build date	1924–1941
Total produced	575
Configuration:;
Specifications
Configuration:;
• Whyte	0-6-0
• UIC	C h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	5 ft 3 in (1.600 m)
Length	52 ft 0+1⁄8 in (15.853 m)
Loco weight	48.75 long tons (49.53 t; 54.60 short tons)
Tender weight	41.20 long tons (41.86 t; 46.14 short tons)
Fuel type	Coal
Fuel capacity	4 long tons (4.1 t; 4.5 short tons)
Water cap.	3,500 imp gal (16,000 L; 4,200 US gal)
Firebox:
• Grate area	21 sq ft (2.0 m2)
Boiler	LMS type G7S
Boiler pressure	175 lbf/in2 (1.21 MPa)
Heating surface:
• Firebox	124 sq ft (11.5 m2)
• Tubes and flues	1,034 sq ft (96.1 m2)
Superheater:;
• Heating area	252 sq ft (23.4 m2) later 246 sq ft (22.9 m2)
Cylinders	Two, inside
Cylinder size	20 in × 26 in (508 mm × 660 mm)
Valve gear	Stephenson
Valve type	piston valves
Loco brake	Vacuum
Train brakes	Vacuum
Tractive effort
Performance figures
Tractive effort	24,555 lbf (109.23 kN)
Operators
Career
Operators	London, Midland and Scottish Railway; British Railways;
Power class	4F
Numbers	LMS: 4027–4606; BR: 44027–44606;
Axle load class	BR: Route Availability 5
Locale	London Midland Region
Withdrawn	1959–1966
Disposition	3 preserved, remainder scrapped

The London, Midland and Scottish Railway (LMS) Fowler Class 4F is a class of 0-6-0 steam locomotive designed for medium freight work. They represent the ultimate development of the Midland Railway's six-coupled tender engines. Many trainspotters knew them as "Duck Sixes", a nickname derived from their wheel arrangement.