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.
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 Middle Run Media | ||
---|---|---|
Class | 18" Tank / Watford Tank | Coal Tank |
Locobase ID | 3191 | 2172 |
Railroad | London & North Western | London & North Western |
Country | Great Britain | Great Britain |
Whyte | 0-6-2T | 0-6-2T |
Number in Class | 80 | 300 |
Road Numbers | ||
Gauge | Std | Std |
Number Built | 80 | 300 |
Builder | L&NW - Crewe | L&NW - Crewe |
Year | 1898 | 1881 |
Valve Gear | Joy | Joy |
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 / 42,674 | 76,160 / 34,546 |
Engine Weight (lbs / kg) | 116,480 / 52,835 | 98,560 / 44,706 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
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 / 26 | 42 / 21 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 62 / 1575 | 51 / 1295 |
Boiler Pressure (psi / kPa) | 160 / 1100 | 150 / 1030 |
High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 | 17" x 24" / 432x610 |
Tractive Effort (lbs / kg) | 17,057 / 7736.93 | 17,340 / 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 / 8.83 | 94.60 / 8.79 |
Grate Area (sq ft / m2) | 17 / 1.58 | 17.10 / 1.59 |
Evaporative Heating Surface (sq ft / m2) | 1080 / 100.37 | 1075 / 99.91 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 1080 / 100.37 | 1075 / 99.91 |
Evaporative Heating Surface/Cylinder Volume | 152.79 | 170.50 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 2720 | 2565 |
Same as above plus superheater percentage | 2720 | 2565 |
Same as above but substitute firebox area for grate area | 15,200 | 14,190 |
Power L1 | 3637 | 3130 |
Power MT | 255.68 | 271.81 |