Deutsche Bundesbahn 2-8-2 Locomotives in Germany

Class Details by Steve Llanso of Sweat House Media

Class BR 041 / 042 Oil (Locobase 3856)

Data from []; and "Lokomotiven der Baureihe 41" on Alfred Gieseler's Dampfmaschinen und Lokomotiven at [], both last accessed 1 November 2020.

Locobase 4316 describes the original 1937 design. The current entry discusses the rebuilt 41s with new welded boilers with combustion chambers -- the boiler was identical to that of the BR 03 10 rebuild.. Forty also were converted to burning oil and redesignated as 042s.

An account of the program published on the web by a club that supports another of these updated Mikes -- [] (visited 14 June 2005) -- talks more about the actual conversion.

As with the East German rebuilds (Locobase 5798), the need for such an effort came from the premature aging of the St 47 K alloy that was used in wartime locomotive boilers. The Bundesbahn locomotives gave up 1.6 m (5 1/4 feet) of tube length to add a combustion chamber. Also, the boiler courses had different diameters, the first course measuring 1,750 mm (68.9"), the second 1,900 mm (74.8").

In his account of the East German program, Frosch ([], visited 10 June 2005) notes that docking the boiler meant a better ratio between "radiation" heating surface and tube heating surface. The combustion chamber, added 7.3 sq m (78.54 sq ft) to the radiation heating surface. Indeed, the larger-than-usual flues accounted for 69% of tube heating surface area.

In the oil burners such as 41 096, creating a combustion chamber meant moving the heavy oil burner by inserting an additional pipe section that moved the burner further back "This was necessary", wrote the 41 096's website discussion as translated by Google, "due to the flame geometry of the oil combustion and the otherwise too high flue gas inlet temperature in the long boiler

The result of this considerable effort was a class that served very satisfactorily until the end of steam, which came in the summer of 1971.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassBR 041 / 042 Oil
Locobase ID3856
RailroadDeutsche Bundesbahn
Number in Class103
Road Numbers
Number Built
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)18.21 / 5.55
Engine Wheelbase (ft / m)39.53 / 12.05
Ratio of driving wheelbase to overall engine wheelbase 0.46
Overall Wheelbase (engine & tender) (ft / m)66.19 / 20.18
Axle Loading (Maximum Weight per Axle) (lbs / kg)43,475 / 19,720
Weight on Drivers (lbs / kg)171,475 / 77,780
Engine Weight (lbs / kg)241,692 / 109,630
Tender Loaded Weight (lbs / kg)166,008 / 75,300
Total Engine and Tender Weight (lbs / kg)407,700 / 184,930
Tender Water Capacity (gals / ML)8984 / 34.03
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)14.30 / 13
Minimum weight of rail (calculated) (lb/yd / kg/m)71 / 35.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)20.47" x 28.35" / 520x720
Tractive Effort (lbs / kg)37,200 / 16873.66
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.61
Heating Ability
Tubes (number - dia) (in / mm)80 - 2.756" / 70
Flues (number - dia) (in / mm)42 - 5.63" / 143
Flue/Tube length (ft / m)17.06 / 5.20
Firebox Area (sq ft / m2)228.41 / 21.22
Grate Area (sq ft / m2)41.98 / 3.90
Evaporative Heating Surface (sq ft / m2)2269 / 210.80
Superheating Surface (sq ft / m2)1030 / 95.72
Combined Heating Surface (sq ft / m2)3299 / 306.52
Evaporative Heating Surface/Cylinder Volume210.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9744
Same as above plus superheater percentage12,764
Same as above but substitute firebox area for grate area69,448
Power L128,619
Power MT1471.80

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