Fribourg-Lausanne 4-4-0 Locomotives in Switzerland

Class Details by Steve Llanso of Sweat House Media

Class Romont (Locobase 3168)

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 Sweat House Media

Locobase ID3168
Number in Class12
Road Numbers1-12
Number Built12
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)90,405 / 41,007
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 / 8.10
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 Volume197.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1517
Same as above plus superheater percentage1517
Same as above but substitute firebox area for grate area
Power L1
Power MT

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