Data from Titre Exposition universelle internationale de 1878 a Paris. Rapports du jury internationale..Volume Groupe VI - Classe 64. Rapport sur le materiel des chemins de fer. p. 56 (cnum.cnam.fr/CGI/fpage.cgi?8XAE277-11.1/54/100/312/0/0 (accessed 1 September 2005) table; and "Tramway Locomotive", Engineering, Volume 27 (28 March 1879), pp. 256-257. See also Danel. Kinnear Clark CE, Tramways - Their Construction and Working (London: Crosby, Lockwood & Co, 1878).
Part of an extensive display of tramway locomotives, this tram engine doesn't match up with any of those described in Kinnear's survey. Engineering, however, offered a full view of this design, which included the excellent view from the driver's position halfway along the side of the boiler. Regardless of the tram's direction, he could work one set of levers.
The most interesting comments in Engineering's report concern the reception steam-powered tram motors had encountered in the brief time they had been in service. Merryweather's steam motor production already exceeded 100 and were shown to have achieve "creditable progress" in overcoming resistance.
Herr Carp of the Cassel [sic] Tramway Company said the Merryweathers in his stud "did not emit smoke or steam and made exceedingly little noise." They could stop within their own length. Average speed in town was 8 mph (13 kph) and outside of town 10 mph (16 kph).
Despite all the claimed advantages, Adelaide, Australia's extensive tram system used steam tram motors for only three years before reverting to horse-drawn traction.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Eureka |
| Locobase ID | 7399 |
| Railroad | Adelaide Tramway |
| Country | Australia |
| Whyte | 0-4-0T |
| Number in Class | 1 |
| Road Numbers | 1 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Merryweather |
| Year | 1877 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4.50 / 1.37 |
| Engine Wheelbase (ft / m) | 4.50 / 1.37 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 4.50 / 1.37 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 13,448 / 6100 |
| Engine Weight (lbs / kg) | 13,448 / 6100 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 132 / 0.50 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 11 / 5.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 23.60 / 599 |
| Boiler Pressure (psi / kPa) | 145 / 1000 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 6.5" x 10" / 165x254 |
| Tractive Effort (lbs / kg) | 2206 / 1000.63 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.10 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 64 - 1.732" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 4.99 / 1.52 |
| Firebox Area (sq ft / m2) | 26.79 / 2.49 |
| Grate Area (sq ft / m2) | 3.66 / 0.34 |
| Evaporative Heating Surface (sq ft / m2) | 173 / 16.08 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 173 / 16.08 |
| Evaporative Heating Surface/Cylinder Volume | 450.45 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 531 |
| Same as above plus superheater percentage | 531 |
| Same as above but substitute firebox area for grate area | 3885 |
| Power L1 | 4558 |
| Power MT | 1494.45 |