Data from "Passenger Locomotives - 5ft 6in 2-4-2 Tank", London & North Western Railway Society, [], last accessed 8 October 2022. Crewe works numbers were 3152-3171, 3222-3241, 3252-3261, 3385-3434, 3480-3489, 3495-3504, 3511-3530, 3757-3776 in
These succeeded the 1879 Samson class 2-4-0 tank engines, adding a trailing truck with taller drivers, higher-pressure boiler. Their design was based on the Precursor 2-4-0s.
42 of the class underwent conversions to push-pull motors in 1929-1932
The class proved a useful, long-lived group. Only three had been withdrawn when the LNWR joined several other railways in the newly formed London, Midland & Scottish (LMS) in 1923. Of these, 43 took British Railways numbers upon nationalization in 1948. The last of the class retired in 1956.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 5ft 6-in tank |
| Locobase ID | 2179 |
| Railroad | London & North Western (LMS) |
| Country | Great Britain |
| Whyte | 2-4-2T |
| Number in Class | 160 |
| Road Numbers | 6602-6757 |
| Gauge | Std |
| Number Built | 160 |
| Builder | L&NW - Crewe |
| Year | 1890 |
| Valve Gear | Joy |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.25 / 2.51 |
| Engine Wheelbase (ft / m) | 22.42 / 6.83 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 22.42 / 6.83 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 33,376 / 15,139 |
| Weight on Drivers (lbs / kg) | 64,736 / 29,364 |
| Engine Weight (lbs / kg) | 113,120 / 51,310 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1616 / 6.12 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.80 / 2.50 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 54 / 27 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 66 / 1676 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 |
| Tractive Effort (lbs / kg) | 13,399 / 6077.69 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.83 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 94.60 / 8.79 |
| Grate Area (sq ft / m2) | 17.10 / 1.59 |
| Evaporative Heating Surface (sq ft / m2) | 1044 / 96.99 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1044 / 96.99 |
| Evaporative Heating Surface/Cylinder Volume | 165.58 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2565 |
| Same as above plus superheater percentage | 2565 |
| Same as above but substitute firebox area for grate area | 14,190 |
| Power L1 | 3970 |
| Power MT | 270.40 |