Data from [] (9 May 2003 -- the website of the London & North Western Railway Society's Goods Locomotives "exhibit" and from "Four-Coupled Shunting Engine, L & NW Ry," The Locomotive Magazine, Vol V (February 1900), p.24 and W A Tuplin, The Steam Locomotive: Its Form and Function (New York: Charles Scribner's Sons, 1974),
Francis W Webb wanted a yard engine that could negotiate quite tight curves without derailing, so he placed a trailing axle in a "carriage"(known to most as a Bissell truck) at the end of an arm that pivoted on a point just behind the rear driving set. "[I]t will readily be seen," said the grammatically precise LM author," that with this pivot as a center the carriage is free to move laterally and accommodate itself to the road." Indeed, a conical roller and two inclined planes under the carriage meant that the axle also was self-centering. This trailing-truck design earned the class the nickname "Bissell tanks".
Locobase wants to describe the tank as a "pannier tank", but realizes that the square cross-section of the tank does in fact lie on the boiler (rather than flanking it). The whole locomotive looks as if it had been carved out of a block of wood. The class suited its requirement quite well and some operated until 1967.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Dock tank |
Locobase ID | 2184 |
Railroad | London & North Western |
Country | Great Britain |
Whyte | 0-4-2ST |
Number in Class | 20 |
Road Numbers | |
Gauge | Std |
Number Built | 20 |
Builder | L&NW - Crewe |
Year | 1896 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 7.25 / 2.21 |
Engine Wheelbase (ft / m) | 15.50 / 4.72 |
Ratio of driving wheelbase to overall engine wheelbase | 0.47 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 58,240 / 26,417 |
Engine Weight (lbs / kg) | 78,400 / 35,562 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 53 / 1346 |
Boiler Pressure (psi / kPa) | 150 / 1030 |
High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 |
Tractive Effort (lbs / kg) | 16,686 / 7568.65 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.49 |
Heating Ability | |
Tubes (number - dia) (in / mm) | |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | |
Firebox Area (sq ft / m2) | 85 / 7.90 |
Grate Area (sq ft / m2) | 15 / 1.39 |
Evaporative Heating Surface (sq ft / m2) | 967 / 89.87 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 967 / 89.87 |
Evaporative Heating Surface/Cylinder Volume | 153.37 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 2250 |
Same as above plus superheater percentage | 2250 |
Same as above but substitute firebox area for grate area | 12,750 |
Power L1 | 2925 |
Power MT | 221.45 |