Data from W H Maw and William Dredge, "Locomotives", Reports on the Vienna Universal Exhibition, Part II (London: George Eyre and William Spottiswoode, 1874), pp. 421-422.
Unlike some of the locomotives appearing at the 1873 Exhibition, this design was designed to serve modestly paced passenger trains. The specifications from Bergisch's locomotive superintendent Stambke required a 31-mph (50-kmh) speed up a 1 in 72 (1.35%) grade pulling a 140-ton train in the Upper Rhine region where the railroad ran.. Maw and Dredge pronounced the engine as "altogether well-built and of a very serviceable type."
NB: Heating surface areas in the specifications are given in the original as derived from the water-side diameter of the tubes. Fire-side tube area was 96 sq m (1,033 sq ft).
Data from "Fast Passenger Engines--Bergische-Markische Railway. Prussia", Engineer, Volume 23, No 3 (18 January 1867), p. 57. works number illustrated was 1781 in 1866.
Built to handle fast passenger traffice between Dusseldorf and Dortmund, these engines had some unusual features. Their railway offered several sections of 1 in 100 (1%) and 1 in 140 (0.7%) adverse grades in a setting of "fine country inhabited by an industrious people."
To negotiate the 1 1/2 mile, 2.5% grade between Erkrath and Hockdale, the B-M used a hybrid system. Trains were hauled up the incline by rope that led up to a big wheel and back down to a Borsig-built six-coupled engine that augmented its weight and traction with gravitational pull down an adjacent track. Engineer suspected the rope would soon be abandoned.
Two domes on the boiler served different functions. The one just behind the stack held steam as usual. The one closer to the firebox enclosed the Wagner feed-water purifier. Hot water entered at the top, flowed down through a series of pans that captured the sediment dropping out, and entered the boiler.
The large grate used slack coal, which was very fine, sometimes just coal dust. To explain why the fuel didn't just fall through the grate, Engineer noted that the initial fire used large coal, which then accepted a slurry of thick mortar consistency made of slack coal and water. "The fuel quickly cakes," the account added, "and may then be broken up, burning with little waste." Spraying the smokebox with a fine jet of water suppressed the sparks produced.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | unknown | unknown |
Locobase ID | 13218 | 20832 |
Railroad | Bergisch-Markische | Bergisch-Markische |
Country | Germany | Prussia |
Whyte | 2-4-0 | 2-4-0T |
Number in Class | ||
Road Numbers | ||
Gauge | Std | Std |
Number Built | ||
Builder | Vulkan | Borsig |
Year | 1873 | 1866 |
Valve Gear | Stephenson | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 8.53 / 2.60 | |
Engine Wheelbase (ft / m) | 14.44 / 4.40 | |
Ratio of driving wheelbase to overall engine wheelbase | 0.59 | |
Overall Wheelbase (engine & tender) (ft / m) | ||
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 28,561 / 12,955 | 24,640 / 11,177 |
Weight on Drivers (lbs / kg) | 55,440 / 25,147 | 49,280 / 22,353 |
Engine Weight (lbs / kg) | 78,401 / 35,562 | 73,920 / 33,530 |
Tender Loaded Weight (lbs / kg) | ||
Total Engine and Tender Weight (lbs / kg) | ||
Tender Water Capacity (gals / ML) | ||
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 | 41 / 20.50 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 60 / 1524 | 72 / 1829 |
Boiler Pressure (psi / kPa) | 145 / 1000 | 112 / 770 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16.5" x 22" / 419x559 | 16" x 22" / 406x559 |
Tractive Effort (lbs / kg) | 12,303 / 5580.55 | 7447 / 3377.91 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.51 | 6.62 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 188 - 1.811" / 46 | 180 - 2.75" / 70 |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 12.14 / 3.70 | 7.87 / 2.40 |
Firebox Area (sq ft / m2) | 75.35 / 7 | 80 / 7.43 |
Grate Area (sq ft / m2) | 17.65 / 1.64 | 18.50 / 1.72 |
Evaporative Heating Surface (sq ft / m2) | 1154 / 107.20 | 1100 / 102.19 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 1154 / 107.20 | 1100 / 102.19 |
Evaporative Heating Surface/Cylinder Volume | 211.95 | 214.86 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 2559 | 2072 |
Same as above plus superheater percentage | 2559 | 2072 |
Same as above but substitute firebox area for grate area | 10,926 | 8960 |
Power L1 | 4077 | 3938 |
Power MT | 324.25 | 352.35 |