London & North Western 0-6-2 Locomotives in Great_Britain


Class Details by Steve Llanso of Sweat House Media

Class 18" Tank / Watford Tank (Locobase 3191)

Data from W A Tuplin, The Steam Locomotive: Its Form and Function (New York: Charles Scribner's Sons, 1974),

Tank engine of an unusual wheel arrangement by FW Webb. Built between 1881-1890 and in service until 1958.

The 1898 version of this unusual arrangement fitted with 18" cylinders; the last one left service in 1953. Interestingly, 70 of the 80 were delivered into service with piston valves, although most were later converted to a slide-valve layout. They were noteworthy for pulling a good load and showing a good turn of speed.


Class Coal Tank (Locobase 2172)

Data from W A Tuplin, The Steam Locomotive: Its Form and Function (New York: Charles Scribner's Sons, 1974),

Tank engine of an unusual wheel arrangement by FW Webb. Built between 1881-1890 and in service until 1958. Chris Northedge, author of [] (9 May 2003 -- the website of the London & North Western Railway Society's Goods Locomotives "exhibit" -- agrees that the arrangement was odd, but that the engines were very successful:

"...paradoxically the Coal Tanks became a firm favourite. They were maids-of-all-work with not the slightest hint of glamour; only a middling amount of power (compared to later designs); and their inadequate brake leverage led mostly to excitement in their inability to stop: Crews must have had many a nervous moment!

But they were work-a-day engines, hard to beat for value for money with a wide range of flexibility. Lacking even the shapely spokes of normal wheels, perhaps it was Webb's H-spoked wheels of cast iron which set the seal on their rugged chunkiness".

See Locobase 9543 for a 2-6-0T, Webb-compound version of this design.

Principal Dimensions by Steve Llanso of Sweat House Media

Class18" Tank / Watford TankCoal Tank
Locobase ID3191 2172
RailroadLondon & North WesternLondon & North Western
CountryGreat BritainGreat Britain
Whyte0-6-2T0-6-2T
Number in Class80300
Road Numbers
GaugeStdStd
Number Built80300
BuilderL&NW - CreweL&NW - Crewe
Year18981881
Valve GearJoyJoy
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.50 / 4.72
Engine Wheelbase (ft / m)21.25 / 6.48
Ratio of driving wheelbase to overall engine wheelbase 0.73
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)26,880 / 12,193
Weight on Drivers (lbs / kg)94,080 / 42,67476,160 / 34,546
Engine Weight (lbs / kg)116,480 / 52,83598,560 / 44,706
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)116,480 / 52,83598,560 / 44,706
Tender Water Capacity (gals / ML)1380 / 5.23
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)52 / 2642 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 157551 / 1295
Boiler Pressure (psi / kPa)160 / 11150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x61017" x 24" / 432x610
Tractive Effort (lbs / kg)17,057 / 7736.9317,340 / 7865.30
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.52 4.39
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)95 / 8.8394.60 / 8.79
Grate Area (sq ft / m2)17 / 1.5817.10 / 1.59
Evaporative Heating Surface (sq ft / m2)1080 / 100.371075 / 99.91
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1080 / 100.371075 / 99.91
Evaporative Heating Surface/Cylinder Volume152.79170.50
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation27202565
Same as above plus superheater percentage27202565
Same as above but substitute firebox area for grate area15,20014,190
Power L136373130
Power MT255.68271.81

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