Gotthardbahn 4-4-0 Locomotives in Switzerland


Class Details by Steve Llanso of Sweat House Media

Class B/Eb 2/4 (Locobase 5120)

Data from [], last accessed 19 January 2017, (First viewed August 2002). See also "Report on Locomotives for the St. Gothard [sic] Railway", The Engineer, Volume 54 (17 November 1882), pp. 368-371. Works numbers were 1007-1012 in 1882.

These Eight-wheeler tanks ran up to the end of steam on the GB, retiring in 1927.


Class Ea 2/4 (Locobase 5121)

Data from [], last accessed 19 January 2017, (First viewed August 2002). Works numbers were 1548-1550 in 1890.

Larger versions of the 1882 tanks described in Locobase 5120, the boilers offered a bit more steam at higher pressure. The big difference, however, was the adoption of much taller drivers.

These engines retired in 1923.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassB/Eb 2/4Ea 2/4
Locobase ID5120 5121
RailroadGotthardbahnGotthardbahn
CountrySwitzerlandSwitzerland
Whyte4-4-0T4-4-0T
Number in Class63
Road Numbers25-3031-33
GaugeStdStd
Number Built63
BuilderKraussMaffei
Year18821890
Valve GearAllan
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.89 / 2.10 7.87 / 2.40
Engine Wheelbase (ft / m)20.67 / 6.3021.33 / 6.50
Ratio of driving wheelbase to overall engine wheelbase 0.33 0.37
Overall Wheelbase (engine & tender) (ft / m)20.67 / 6.30
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)61,729 / 28,00068,784 / 31,200
Engine Weight (lbs / kg)102,515 / 46,500120,813 / 54,800
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)102,515 / 46,500120,813 / 54,800
Tender Water Capacity (gals / ML)1420 / 5.381531 / 5.80
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 2.20 / 2 2.50 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.5057 / 28.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62.20 / 158073.60 / 1870
Boiler Pressure (psi / kPa)145 / 10174 / 12
High Pressure Cylinders (dia x stroke) (in / mm)16.14" x 24.09" / 410x61216.14" x 24.02" / 410x610
Tractive Effort (lbs / kg)12,435 / 5640.4312,574 / 5703.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.96 5.47
Heating Ability
Tubes (number - dia) (in / mm)150 - 2.008" / 51160 - 1.969" / 50
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.19 / 4.0212.99 / 3.96
Firebox Area (sq ft / m2)78.58 / 7.3083.96 / 7.80
Grate Area (sq ft / m2)15.07 / 1.4017.22 / 1.60
Evaporative Heating Surface (sq ft / m2)1115 / 103.601155 / 107.34
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1115 / 103.601155 / 107.34
Evaporative Heating Surface/Cylinder Volume195.46203.06
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21852996
Same as above plus superheater percentage21852996
Same as above but substitute firebox area for grate area11,39414,609
Power L139735909
Power MT283.79378.78

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