Simplon 2-4-0 Locomotives in Switzerland


Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 9908)

Data from P Nicou, "L'Exposition de Milan et Le Simplon" , Bulletin de SociTtT de l'industrie minTrale (France), Tome VI (1907), p 64.

During the construction of the Simplon Tunnel in Switzerland, the builder used both air-driven and steam-driven locomotives. To reduce the smoke buildup from working the steam engines, the last load of coal was loaded onto the grate before it entered the tunnel. At this point, the boiler registered 15 atmospheres. This gave a sufficient reserve over the the 7 atm that would be the minimum useful pressure to work the engine.

Principal Dimensions by Steve Llanso of Middle Run Media
Classunknown
Locobase ID9908
RailroadSimplon
CountrySwitzerland
Whyte2-4-0T
Number in Class
Road Numbers
Gauge80 cm
Number Built
BuilderSLM
Year1874
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.59 / 1.40
Engine Wheelbase (ft / m) 8.04 / 2.45
Ratio of driving wheelbase to overall engine wheelbase 0.57
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)26,455 / 12,000
Engine Weight (lbs / kg)34,172 / 15,500
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)911 / 3.45
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.40
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)24.40 / 620
Boiler Pressure (psi / kPa)217.60 / 1500
High Pressure Cylinders (dia x stroke) (in / mm)9.84" x 11.81" / 250x300
Tractive Effort (lbs / kg)8668 / 3931.74
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.05
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) 5.38 / 0.50
Evaporative Heating Surface (sq ft / m2)355 / 33
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)355 / 33
Evaporative Heating Surface/Cylinder Volume341.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1171
Same as above plus superheater percentage1171
Same as above but substitute firebox area for grate area
Power L1
Power MT

All material Copyright © SteamLocomotive.com
Wes Barris