Saechsischen 0-4-2 Locomotives in Germany

Class Details by Steve Llanso of Sweat House Media

Class IIIb T / BR 98 72 (Locobase 9577)

Data from [], last accessed 28 September 2008, supplemented by []

These little tanks were delivered in two batches. The first set of orders were produced by two companies. Schwartszkopff delivered a set to the Muldenthal-Eisenbahngesellschaft. At the same time SSchsische Maschinenfabrik (the renamed Hartmann) delivered identical engines to Chemnitz-Aue-Adorfer Eisenbahn-Gesellschaft (ChAA).

All of them had tall steam domes in front of squared-off Belpaire fireboxes and tall inversely tapered stacks. Weight grew steadily with the delivery of each pair of locomotives. The first two weighed in in 1875 at 29,300 kg adhesive weight, 38,700 kg engine weight and had slightly larger firebox heating surfaces of 6.55 sq m.

Soon after these orders, the two railways were absorbed by the state railway system. In late 1880s, the SStE added 20 locomotives to the stud in three separate orders in the 1889-1892 period.

When the DRG stood up in 1925, it retained 9 of the IIIb which it then designated BR 98 72. All of these had been retired by the end of the 1920s, although one served in an industrial setting (RAW Leipzig) until 1934.

Although 9 were taken into the DRG

Principal Dimensions by Steve Llanso of Sweat House Media

ClassIIIb T / BR 98 72
Locobase ID9577
RailroadSaechsischen (Saxon) Staats-Eisenbahnen
Number in Class42
Road Numbers98 7211-12, 7221-7227
Number Built42
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.19 / 2.80
Engine Wheelbase (ft / m)13.21 / 4.03
Ratio of driving wheelbase to overall engine wheelbase 0.70
Overall Wheelbase (engine & tender) (ft / m)13.21 / 4.03
Axle Loading (Maximum Weight per Axle) (lbs / kg)33,510 / 15,200
Weight on Drivers (lbs / kg)67,241 / 30,500
Engine Weight (lbs / kg)91,712 / 41,600
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)91,712 / 41,600
Tender Water Capacity (gals / ML)950 / 3.60
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.10 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55.90 / 1420
Boiler Pressure (psi / kPa)145 / 10
High Pressure Cylinders (dia x stroke) (in / mm)22.01" x 16.34" / 559x415
Tractive Effort (lbs / kg)17,453 / 7916.56
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.85
Heating Ability
Tubes (number - dia) (in / mm)176 - 1.772" / 45
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.40 / 3.17
Firebox Area (sq ft / m2)69.29 / 6.44
Grate Area (sq ft / m2)13.67 / 1.27
Evaporative Heating Surface (sq ft / m2)823 / 76.46
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)823 / 76.46
Evaporative Heating Surface/Cylinder Volume114.38
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1982
Same as above plus superheater percentage1982
Same as above but substitute firebox area for grate area10,047
Power L12196
Power MT144.00

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Wes Barris