Works numbers were 39-48 in 1857.
One of many Stephenson "long-boiler" designs that ran on European railroads from the 1840s until the end of the century. Like so many designs of the period, these engines look front heavy, leading with a tall stack, a steam dome almost as tall with safety-valve appurtances on top, a cylindrical sand bin over the first coupled driver set. This may have been necessary because of the firebox location, which was behind the rear driver set.
When the Swiss Western later became the Jura-Simplon, the engines were renumbered 51, 54-61 and eventually were fitted with air brakes, but were otherwise unmodified until the end of their long service.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Medoc |
| Locobase ID | 2543 |
| Railroad | Swiss Western |
| Country | Switzerland |
| Whyte | 2-4-0 |
| Number in Class | 15 |
| Road Numbers | 6-15/51, 54-61/1077 |
| Gauge | Std |
| Number Built | 15 |
| Builder | Karlsruhe |
| Year | 1857 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | 44.80 / 13.66 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 20,150 / 9140 |
| Weight on Drivers (lbs / kg) | 40,000 / 18,144 |
| Engine Weight (lbs / kg) | 88,500 / 40,143 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 1050 / 3.98 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.60 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 33 / 16.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 66.20 / 1681 |
| Boiler Pressure (psi / kPa) | 116 / 800 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 9151 / 4150.83 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.37 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 10.75 / 1 |
| Evaporative Heating Surface (sq ft / m2) | 1023 / 95.07 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1023 / 95.07 |
| Evaporative Heating Surface/Cylinder Volume | 183.17 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1247 |
| Same as above plus superheater percentage | 1247 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |