London & North Western 4-2-0 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 175 (Locobase 20958)

Data from "An Old L And NWR Express Locomotive", Locomotive Magazine, Volume XXIX [29], No 371 (14 June 1923), p. 191.

LM presented a photo of the 189 in later years to celebrate driver Bowker, who served 62 years on the L&NWR before his retirement. But the essential details remained the same. A big dome, tall stack, unsheltered footplate (except for a small spectacled weatherboard), single pair of tall drivers just ahead of the firebox were typical of the time.

The outside cylinders separated the two leading carrying axle; the forward wheels under the firebox were transformed into solid discs in later years.


Class London (Locobase 674)

Data from Reder (1974) and G D Dempsey, CE & D Kinnear Clark, CE, A Rudimentary Treatise on the Locomotive Engine (London: Crosby, Lockwood & Co, 1879), p. 63.

A Crampton built for the London & Birmingham, but delivered after the L&B, Manchester and Birmingham, and Grand Junction Railway merger into the London and North Western. Notice the relatively large boiler, but small firebox.

Reached 65 1/2 mph (105 kph)and averaged 58 1/2 mph (94 kph), Wolverton to London with twelve coaches. Usual "duty" according to Dempsey & Clark, was 75 trailing tons at 55.4 mph (89 kph) for 3 miles and 55 trailing tons at 53 mph (85 kph) for 30 miles (48 km).

Unsuccessful because it was hard on tracks.

Principal Dimensions by Steve Llanso of Sweat House Media

Class175London
Locobase ID20958 674
RailroadLondon & North WesternLondon & North Western
CountryGreat BritainGreat Britain
Whyte4-2-04-2-0
Number in Class101
Road Numbers175, 182-190
GaugeStdStd
Number Built101
BuilderJones & PottsL&NW - Crewe
Year18471848
Valve Gear
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)12 / 3.66
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)30,464 / 13,818
Weight on Drivers (lbs / kg)30,464 / 13,818
Engine Weight (lbs / kg)56,672 / 25,706
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2160 / 8.18
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78 / 198196 / 2438
Boiler Pressure (psi / kPa)120 / 8.30100 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x61018" x 20" / 457x508
Tractive Effort (lbs / kg)10,169 / 4612.595738 / 2602.72
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.00
Heating Ability
Tubes (number - dia) (in / mm)117 - 2.25" / 57229 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.92 / 4.2412 / 3.66
Firebox Area (sq ft / m2)64.70 / 6.0191 / 8.46
Grate Area (sq ft / m2)12.50 / 1.1621.50 / 2
Evaporative Heating Surface (sq ft / m2)1024 / 95.131529 / 142.10
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1024 / 95.131529 / 142.10
Evaporative Heating Surface/Cylinder Volume144.87259.57
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15002150
Same as above plus superheater percentage15002150
Same as above but substitute firebox area for grate area77649100
Power L129745389
Power MT215.22

All material Copyright © SteamLocomotive.com
Wes Barris