Zell-und-Todtnau Articulated Locomotives in Germany


Class Details by Steve Llanso of Sweat House Media

Class 103 (Locobase 3255)

Data from Gustav Reder (Michael Reynolds, trans), The world of steam locomotives (New York: Putnam, 1974), pl 329; supplemented by SACM diagram UG Type 178 from Elsassische Maschinenbau AG from locomotive book supplied by Dany Machi at [] as

Diagrammes des machines SACM construites a GRAFENSTADEN (October 2007). Works number was 4738

Reder cited this engine as an example of the early application of the Mallet layout on a narrow-gauge rail line.

The Z&T ran in the Black Forest and Grafenstaden supplied this Mallet design in 1896. According to the Todtnauer website -- [], last accessed 24 October 2006 -- the Z&T operated the 103 until 1955, when it was sold to the M.E.G. Stammbahn in Schwarzach. It was scrapped in 1960.

NB: the heating surface area in the diagram is calculated from the fire side. Water-side area would be 491 sq ft (45.6 sq m).

Principal Dimensions by Steve Llanso of Middle Run Media

Class103
Locobase ID3255
RailroadZell-und-Todtnau
CountryGermany
Whyte0-4-4-0T
Number in Class1
Road Numbers103
GaugeMetre
Number Built1
BuilderGrafenstaden
Year1896
Valve GearHeusinger
Locomotive Length and Weight
Driver Wheelbase (ft / m) 3.77 / 1.15
Engine Wheelbase (ft / m)13.12 / 4
Ratio of driving wheelbase to overall engine wheelbase 0.29
Overall Wheelbase (engine & tender) (ft / m)13.12 / 4
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)61,443 / 27,870
Engine Weight (lbs / kg)61,443 / 27,870
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)61,443 / 27,870
Tender Water Capacity (gals / ML)1056 / 4
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.10 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)26 / 13
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)35.40 / 900
Boiler Pressure (psi / kPa)179.80 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)9.84" x 17.72" / 250x450
Low Pressure Cylinders (dia x stroke) (in / mm)14.96" x 17.72" / 380x450
Tractive Effort (lbs / kg)10,341 / 4690.60
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.94
Heating Ability
Tubes (number - dia) (in / mm)89 - 1.772" / 45
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.83 / 3.30
Firebox Area (sq ft / m2)44.35 / 4.12
Grate Area (sq ft / m2) 8.07 / 0.75
Evaporative Heating Surface (sq ft / m2)452 / 41.95
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)452 / 41.95
Evaporative Heating Surface/Cylinder Volume289.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1451
Same as above plus superheater percentage1451
Same as above but substitute firebox area for grate area7974
Power L11983
Power MT284.61

All material Copyright © SteamLocomotive.com
Wes Barris