Bavarian State 0-10-0 Locomotives in Germany


Class Details by Steve Llanso of Sweat House Media

Class 5/5 / BR 57.5 (Locobase 10817)

Data from Christian Lindecke's Lokodex website ([], last accessed 27 October 2009). See also "Balanced Compound Freight Locomotive, Bavarian State Railways," Railway Master Mechanic, Vol XXXVI, No 4 (April 1912), pp. 145- as well as the Maffei advertisement promoting its appearance at the 1911 Turin International Exposition, which appears at []

This rugged, powerful design was required to ascend grades of 1-1.1% at a minimum speed of 15-16 mph (25 kph). It was a well-balanced and equalized design that could reach 60 kph (37 mph) on level ground with heavy trains.

Steam admission was simplified by simply enormous piston valves of diameters measuring 390 mm (15 1/4") for the HP cylinders and 425 mm (17 3/4") for the LP side. The real novelty lay in the provision of a annular receiver that served both pistons on a side. Note that the stroke for the LP cylinder ran 30 mm longer than did that of HP cylinder.

A similar arrangement from Baldwin -- the Vauclain compound system -- did not vary strokes as this setup did.

The RMM report notes several advantages of such an arrangement: "Two simple steam pipes suffice, however, with the new valve. The simplicity realized is considerable. Mechanically there is a gain represented by the reduction of four valve motions and valves to two. Not only does this save in the matter of first cost, but obviously there is a saving due to the reduction in the weight and frictional resistance of the moving parts. Again, receiver pipes are done away with, and the parts in the smoke-box are reduced. Thermally, the arrangement steams-jackets part of the valve chest and the interior of the valve itself, the steam pressure that is constantly maintained therein being from one-fourth to one-third of the initial pressure of the first expansion."

The design proved to be quite powerful and successful and the K Bay ordered 80 more to a a somewhat larger design in 1923-1924; see Locobase 15204.


Class 5/5 / BR 57.5 (Locobase 15204)

Data from Albert Gieseler's website at [] . Maffei delivered 40 in 1923-1924.

Locobase 10817 describes the 1911 design that the K.Bay.St put into service on 1.1% grades pulling heavy freights. After Maffei delivered the second batch in 1920, the builder and the railway tweaked the design. First to go were the annular piston valves and stroke lengths that differed from HP to LP cylinders. Cylinder stroke was equal for all four cylinders and the cylinder diameter increased. Then taking the firebox as it was and the boiler's diameter as it was, Maffei swapped out 30 tubes in favor of four more superheater flues.

Although combined heating surface dropped by about 3%, the superheater ratio increased and the increased cylinder volume led to a higher starting tractive effort.

Principal Dimensions by Steve Llanso of Sweat House Media

Class5/5 / BR 57.55/5 / BR 57.5
Locobase ID10817 15204
RailroadBavarian StateBavarian State
CountryGermanyGermany
Whyte0-10-00-10-0
Number in Class1540
Road Numbers5801-5815 / 57 501-57 5505856-5895 / 57 551-57 590
GaugeStdStd
Number Built1540
BuilderMaffeiMaffei
Year19111923
Valve GearHeusingerHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m)19.69 / 619.69 / 6
Engine Wheelbase (ft / m)19.69 / 619.69 / 6
Ratio of driving wheelbase to overall engine wheelbase11
Overall Wheelbase (engine & tender) (ft / m)48.23 / 14.7049.90 / 15.21
Axle Loading (Maximum Weight per Axle) (lbs / kg)34,613 / 15,70036,817 / 16,700
Weight on Drivers (lbs / kg)170,858 / 77,500183,865 / 83,400
Engine Weight (lbs / kg)170,858 / 77,500183,865 / 83,400
Tender Loaded Weight (lbs / kg)129,632 / 58,800129,632 / 58,800
Total Engine and Tender Weight (lbs / kg)300,490 / 136,300313,497 / 142,200
Tender Water Capacity (gals / ML)5808 / 225755 / 21.80
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 8.80 / 8 8.30 / 8
Minimum weight of rail (calculated) (lb/yd / kg/m)57 / 28.5061 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 127050 / 1270
Boiler Pressure (psi / kPa)232.10 / 16232.10 / 16
High Pressure Cylinders (dia x stroke) (in / mm)16.73" x 24.02" / 425x61017.72" x 24.02" / 450x610
Low Pressure Cylinders (dia x stroke) (in / mm)25.59" x 25.2" / 650x64027.17" x 24.02" / 690x610
Tractive Effort (lbs / kg)37,696 / 17098.6441,757 / 18940.68
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.53 4.40
Heating Ability
Tubes (number - dia) (in / mm)213 - 2.047" / 52183 - 2.047" / 52
Flues (number - dia) (in / mm)24 - 5.315" / 13528 - 5.236" / 133
Flue/Tube length (ft / m)15.09 / 4.6015.09 / 4.60
Firebox Area (sq ft / m2)142.08 / 13.20142.08 / 13.20
Grate Area (sq ft / m2)39.83 / 3.7039.83 / 3.70
Evaporative Heating Surface (sq ft / m2)2217 / 2062060 / 191.40
Superheating Surface (sq ft / m2)506 / 47577 / 53.60
Combined Heating Surface (sq ft / m2)2723 / 2532637 / 245
Evaporative Heating Surface/Cylinder Volume362.76300.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation92459245
Same as above plus superheater percentage11,00111,278
Same as above but substitute firebox area for grate area39,24240,232
Power L196469556
Power MT622.32572.90

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