Tonsberg-Eidsfos 2-4-2 Locomotives in Norway


Class Details by Steve Llanso of Sweat House Media

Class Tonsberg (Locobase 20342)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 22, p. 72. Works numbers were 16526-16527 in February 1899.

This small (48.1 km/29.9 mi) narrow gauge line opened in October 1901 to link the Eidsfos Iron Works, located southwest of Oslo, to the main line farther south at Tonsberg. Originally planned for 15 kg/metre (30 lb/yard) rail, increased financing allowed an upgrade to 17.5 kg/meter (35 lb/yard) rail.

Baldwin delivered these two locomotives in time to participate in the line's construction. Once it opened, the TEB proved a hit with tourists who traveled between Oslo and Tonsberg. Reasonably successful for about 20 years, the line suffered from post-World War One inflation in costs and no substantial increase in revenue.

The TEB eventually closed in 1928.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassTonsberg
Locobase ID20342
RailroadTonsberg-Eidsfos
CountryNorway
Whyte2-4-2T
Number in Class2
Road Numbers
Gauge3'6"
Number Built2
BuilderBurnham, Williams & Co
Year1899
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.52
Engine Wheelbase (ft / m)17.67 / 5.39
Ratio of driving wheelbase to overall engine wheelbase 0.28
Overall Wheelbase (engine & tender) (ft / m)17.67 / 5.39
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)26,000 / 11,793
Engine Weight (lbs / kg)42,000 / 19,051
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)500 / 1.89
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 1143
Boiler Pressure (psi / kPa)160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)10" x 16" / 254x406
Tractive Effort (lbs / kg)4836 / 2193.58
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.38
Heating Ability
Tubes (number - dia) (in / mm)82 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.17 / 2.49
Firebox Area (sq ft / m2)45.60 / 4.24
Grate Area (sq ft / m2)7 / 0.65
Evaporative Heating Surface (sq ft / m2)305 / 28.34
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)305 / 28.34
Evaporative Heating Surface/Cylinder Volume209.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1120
Same as above plus superheater percentage1120
Same as above but substitute firebox area for grate area7296
Power L14398
Power MT745.84

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