Data from C G Down, "Fox Walker Tramway Locomotives", letter to the Industrial Railway Record, No. 21 (pp. 308-312); "Steam on the Bristol Tramways," Herapath's Railway (and Commercial) Journal, Volume XXXIX, No 2013 (15 December 1877), p. 1329; Van Norstrand's Engineering Magazine, Volume XVIII, No CX (February 1878), p. 186-187; International Exhibition at Paris, 1878: Report of the Commissioners for Victoria to His Excellency the Governor (Melbourne, Vic: John Ferres, 1879). pp. 148-151.
Sometimes assembling a detailed entry in Locobase requires sewing a quilt out of several sources, as is indicated by the paragraph above. The accounts agree that the locomotive described was demonstrated on the Bristol Tramway in late 1877 to show that it would serve the Rouen system well. Although the accounts contend that the meagre tube heating surface area was plenty for the cylinder volume encompassed by the two small cylinders, it seems that Mon. Vignolles increased cylinder size in the tram engines actually delivered.
A large chamber under the smoke box had a conical arrangement of baffles that softened the exhaust (The Herapath's report describing it as "a kind of cage made of iron wire wound spirally round an open frame"), rendering it "noiseless" on level ground and "only slightly audible" when under greater demand on grades.
The locomotive lay horizontally within a tram body. Its cylinders were placed outside the boiler to allow them to drive the axles on cranks set into the drivers themselves. Its trailing bogie used two diagonal crossbars mounted on the frame to accommodate 25-foot radius curves.
Stopping the engine and its trailing car required the operator to step on a pedal. Two blocks suspended on a cross shaft pressed on a disc fixed on the front axle. The apparatus was described as powerful, stopping the tram within its own length at 6 mph and sparing the drivers' tires.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | unknown |
Locobase ID | 20030 |
Railroad | Rouen Tramway |
Country | France |
Whyte | 0-4-2T |
Number in Class | 1 |
Road Numbers | |
Gauge | 4' |
Number Built | 1 |
Builder | Fox Walker & Co |
Year | 1877 |
Valve Gear | |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | |
Engine Wheelbase (ft / m) | 4.50 / 1.37 |
Ratio of driving wheelbase to overall engine wheelbase | |
Overall Wheelbase (engine & tender) (ft / m) | 4.50 / 1.37 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 7500 / 3402 |
Engine Weight (lbs / kg) | 10,000 / 4536 |
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) | 6 / 3 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 24 / 610 |
Boiler Pressure (psi / kPa) | 120 / 830 |
High Pressure Cylinders (dia x stroke) (in / mm) | 8" x 9" / 203x229 |
Tractive Effort (lbs / kg) | 2448 / 1110.40 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.06 |
Heating Ability | |
Tubes (number - dia) (in / mm) | |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | |
Firebox Area (sq ft / m2) | |
Grate Area (sq ft / m2) | 4.60 / 0.43 |
Evaporative Heating Surface (sq ft / m2) | 96 / 8.92 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 96 / 8.92 |
Evaporative Heating Surface/Cylinder Volume | 183.35 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 552 |
Same as above plus superheater percentage | 552 |
Same as above but substitute firebox area for grate area | |
Power L1 | |
Power MT |