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LMS Compound 4-4-0

LMS 4P Compound 4-4-0
Midland compound, 1115 (CJ Allen, Steel Highway, 1928).jpg
LMS 1115 circa 1925–1928
Type and origin
Power type Steam
Builder LMS Derby (75)
LMS Horwich (20);
North British Locomotive Company (25)
Vulcan Foundry (75)
Build date 1924–1932
Total produced 195
Specifications
Configuration:
 ​
 • Whyte 4-4-0
 • UIC 2′B h3v
Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia. 3 ft 6 1⁄2 in (1.080 m)
Driver dia. 6 ft 9 in (2.057 m)
Wheelbase Loco: 24 ft (7.315 m)
Length 56 ft 7 7⁄8 in (17.269 m)
Loco weight 61.70 long tons (62.69 t; 69.10 short tons)
Tender weight 41.2–41.7 long tons (41.9–42.4 t; 46.1–46.7 short tons)
Fuel type Coal
Fuel capacity 4.0–5.5 long tons (4.1–5.6 t; 4.5–6.2 short tons)
Water cap 3,500 imp gal (15,900 l; 4,200 US gal)
Firebox:
 • Firegrate area		 28.5 sq ft (2.65 m2)
Boiler G9AS
Boiler pressure 200 lbf/in2 (1.38 MPa)
Heating surface:
 • Tubes and flues		 1,170 sq ft (109 m2)
 • Firebox 147 sq ft (13.7 m2)
Superheater:
 ​
 • Heating area 290 sq ft (26.9 m2) or
272 sq ft (25.3 m2)
Cylinders
  • One high pressure (inside)
  • Two low pressure (outside)
High-pressure cylinder 19 in × 26 in (483 mm × 660 mm)
Low-pressure cylinder 21 in × 26 in (533 mm × 660 mm)
Valve gear Stephenson
Valve type
Train brakes Vacuum
Performance figures
Tractive effort 22,650 lbf (100.75 kN)
Career
Operators
Power class 4P
Numbers
  • LMS 900–939, 1045–1199
  • BR: 40900-40939, 41045–41199
Withdrawn 1952–1961
Disposition All scrapped
Type and origin
Power type Steam
Builder LMS Derby (75)
LMS Horwich (20);
North British Locomotive Company (25)
Vulcan Foundry (75)
Build date 1924–1932
Total produced 195
Specifications
Configuration:
 ​
 • Whyte 4-4-0
 • UIC 2′B h3v
Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia. 3 ft 6 1⁄2 in (1.080 m)
Driver dia. 6 ft 9 in (2.057 m)
Wheelbase Loco: 24 ft (7.315 m)
Length 56 ft 7 7⁄8 in (17.269 m)
Loco weight 61.70 long tons (62.69 t; 69.10 short tons)
Tender weight 41.2–41.7 long tons (41.9–42.4 t; 46.1–46.7 short tons)
Fuel type Coal
Fuel capacity 4.0–5.5 long tons (4.1–5.6 t; 4.5–6.2 short tons)
Water cap 3,500 imp gal (15,900 l; 4,200 US gal)
Firebox:
 • Firegrate area		 28.5 sq ft (2.65 m2)
Boiler G9AS
Boiler pressure 200 lbf/in2 (1.38 MPa)
Heating surface:
 • Tubes and flues		 1,170 sq ft (109 m2)
 • Firebox 147 sq ft (13.7 m2)
Superheater:
 ​
 • Heating area 290 sq ft (26.9 m2) or
272 sq ft (25.3 m2)
Cylinders
  • One high pressure (inside)
  • Two low pressure (outside)
High-pressure cylinder 19 in × 26 in (483 mm × 660 mm)
Low-pressure cylinder 21 in × 26 in (533 mm × 660 mm)
Valve gear Stephenson
Valve type
Train brakes Vacuum
Performance figures
Tractive effort 22,650 lbf (100.75 kN)
Career
Operators
Power class 4P
Numbers
  • LMS 900–939, 1045–1199
  • BR: 40900-40939, 41045–41199
Withdrawn 1952–1961
Disposition All scrapped

The London, Midland and Scottish Railway Compound 4-4-0 was a class of steam locomotive designed for passenger work.

One hundred and ninety five engines were built by the LMS, adding to the 45 Midland Railway 1000 Class, to which they were almost identical. The most obvious difference is that the driving wheel diameter was reduced from 7 ft 0 in (2.134 m) on the Midland locomotive to 6 ft 9 in (2.057 m) on the LMS version. They were given the power classification 4P.

The LMS continued the Midland numbering from 1045 to 1199 and then started in the lower block of 900–939. After nationalisation in 1948, BR added 40000 to their numbers so they became 40900–40939 and 41045–41199.

The class were withdrawn between 1952 and 1961. None have survived into preservation, though the first of the Midland 1000 Class engines has.


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Wikipedia

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