Designed by Emil Kessler, these were the first 4-4-0Ts to enter service. Works numbers were 575-586 in 1862.
Nicknamed the "Turtle" for its saddle-tank carapace over the boiler, the Romont and the 11 others in this class set the tone for tank engines in Switzerland for almost 30 years.Gustav Reder (Michael Reynolds, trans), The world of steam locomotives (New York: Putnam, 1974), pl. 233 noted that the spread-stance front truck, already common in the US, was still a rarity in Europe.
Fribourg-Lausanne later was absorbed by the Jura-Simplon, where these engines were renumbered 251-262.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Romont |
| Locobase ID | 3168 |
| Railroad | Fribourg-Lausanne |
| Country | Switzerland |
| Whyte | 4-4-0T |
| Number in Class | 12 |
| Road Numbers | 1-12 |
| Gauge | Std |
| Number Built | 12 |
| Builder | Esslingen |
| Year | 1861 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 19.98 / 6.09 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 59,535 / 27,005 |
| Engine Weight (lbs / kg) | 90,405 / 41,007 |
| 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) | 50 / 25 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 117.60 / 810 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16.1" x 24" / 409x610 |
| Tractive Effort (lbs / kg) | 11,516 / 5223.58 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.17 |
| 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) | 12.90 / 1.20 |
| Evaporative Heating Surface (sq ft / m2) | 1117 / 103.81 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1117 / 103.81 |
| Evaporative Heating Surface/Cylinder Volume | 197.52 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1517 |
| Same as above plus superheater percentage | 1517 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |