Data from "G A Sekon"{transparent pseudonym for George Augustus Nokes}, The Evolution of the Steam Locomotive, 1803-1898 (London: The Railway Publishing Company, 1899), p. 233.
Locomotive Superintendent Burnett surveyed his newly completed suburban short line and concluded that a veritable beast of an engine would be necessary to work the steep short grades of the St John's Woods portion of the system. So he contracted to have this quintet built.
Not unsatisfactory in their own right, the class proved too much for the level of passenger traffic over the line - they were too much engine. A better fit for their power was found in 1873 when the Taff Vale Railway purchased the class to pull coal trains over the Penarth Dock lines.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 34 |
| Locobase ID | 10433 |
| Railroad | Metropolitan & St John's |
| Country | Great Britain |
| Whyte | 0-6-0 |
| Number in Class | 5 |
| Road Numbers | 34-38 |
| Gauge | Std |
| Number Built | 5 |
| Builder | Worcester Engine |
| Year | 1868 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14 / 4.27 |
| Engine Wheelbase (ft / m) | 14 / 4.27 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 103,040 / 46,738 |
| Engine Weight (lbs / kg) | 103,040 / 46,738 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 57 / 28.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 24" / 508x610 |
| Tractive Effort (lbs / kg) | 23,800 / 10795.51 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.33 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 176 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 22.50 / 2.09 |
| Evaporative Heating Surface (sq ft / m2) | 1165 / 108.27 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1165 / 108.27 |
| Evaporative Heating Surface/Cylinder Volume | 133.50 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3150 |
| Same as above plus superheater percentage | 3150 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |