LAG / Deutsches Reichsbahn 2-8-2 Locomotives in Germany


Class Details by Steve Llanso of Sweat House Media

Class BR 98.18 / TAG 7 (Locobase 9575)

Data from Wikipedia ([], last accessed 28 September 2008)

Derived from the TAG (Tegernsee-Bahn AG) locomotive of the previous year (which had identical dimensions, but was slightly lighter), this pair of Mikado tanks had taller drivers and proved capable of hitting 70 km/h (45 mph). These three engines were the last to be built for a private German railway in Bavaria and were among the smallest tanks of this wheel arrangement ever built for the standard gauge.

All three survived the war, the 98 18s operating until 1960 and the TAG 7 providing stand-by power until 1975.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassBR 98.18 / TAG 7
Locobase ID9575
RailroadLAG / Deutsches Reichsbahn
CountryGermany
Whyte2-8-2T
Number in Class3
Road NumbersLAG 87-88 / 98 1801-1802
GaugeStd
Number Built3
BuilderKrauss
Year1937
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)26.90 / 8.20
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)26.90 / 8.20
Axle Loading (Maximum Weight per Axle) (lbs / kg)25,794 / 11,700
Weight on Drivers (lbs / kg)101,765 / 46,160
Engine Weight (lbs / kg)134,041 / 60,800
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)134,041 / 60,800
Tender Water Capacity (gals / ML)1663 / 6.30
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)3 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)43.30 / 1100
Boiler Pressure (psi / kPa)198.70 / 13.70
High Pressure Cylinders (dia x stroke) (in / mm)18.11" x 20" / 460x508
Tractive Effort (lbs / kg)25,586 / 11605.63
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.98
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.47 / 3.80
Firebox Area (sq ft / m2)80.05 / 7.44
Grate Area (sq ft / m2)18.72 / 1.74
Evaporative Heating Surface (sq ft / m2)711 / 66.05
Superheating Surface (sq ft / m2)351 / 32.60
Combined Heating Surface (sq ft / m2)1062 / 98.65
Evaporative Heating Surface/Cylinder Volume119.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3720
Same as above plus superheater percentage4947
Same as above but substitute firebox area for grate area21,155
Power L110,269
Power MT889.86

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