Data from Lionel Wiener, "Les Chemins de Fer Du Bresil", Revue Generale des Chemins de Fer et des Tramways, Volume 42, 1 Semestre (Janvier 1923), pp. 16-17. (Thanks to Teemu Koivumaki whose 2023 email included a comprehensive spreadsheet of Brazilian steam locomotive builders, works numbers, and owners. Works numbers were 3392-3401, 3407-3412 in 1913.
Introducing this mixed-traffic engine, Wiener commented that "suburban traffic in Rio is dense." Double-tracking hadn't delivered the desired decongestion as demand grew rapidly. Electrification was on the books, but perhaps always would be. In any event, the longer trains demanded more powerful locomotives.
This design was both powerful, well-endowed with heating surface and grate areas, yet "supple" owing to a rigid wheelbase of only 1.7 metres (5 ft 7 in) using Maffei's bogie design of lead truck and lead coupled axle traverse. It could get around 58 metre curves and hit 70 kph (43.5 mph). The 450s had a very "North American" look that included a full cab, but its dome and sandbox were hidden in a breadloaf casing..
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | 450 |
Locobase ID | 20542 |
Railroad | Central do Brasil (EFCB) |
Country | Brazil |
Whyte | 2-6-2 |
Number in Class | 6 |
Road Numbers | 450-465 |
Gauge | 5'3" |
Number Built | 16 |
Builder | Maffei |
Year | 1913 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 11.48 / 3.50 |
Engine Wheelbase (ft / m) | 27.89 / 8.50 |
Ratio of driving wheelbase to overall engine wheelbase | 0.41 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | |
Engine Weight (lbs / kg) | 152,119 / 69,000 |
Tender Loaded Weight (lbs / kg) | 79,366 / 36,000 |
Total Engine and Tender Weight (lbs / kg) | 231,485 / 105,000 |
Tender Water Capacity (gals / ML) | 3432 / 13 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 62 / 1575 |
Boiler Pressure (psi / kPa) | 179.80 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 23.62" x 25.98" / 600x660 |
Tractive Effort (lbs / kg) | 35,729 / 16206.42 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
Heating Ability | |
Tubes (number - dia) (in / mm) | |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | |
Firebox Area (sq ft / m2) | 139.93 / 13 |
Grate Area (sq ft / m2) | 41.44 / 3.85 |
Evaporative Heating Surface (sq ft / m2) | 1959 / 182 |
Superheating Surface (sq ft / m2) | 517 / 48 |
Combined Heating Surface (sq ft / m2) | 2476 / 230 |
Evaporative Heating Surface/Cylinder Volume | 148.68 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 7451 |
Same as above plus superheater percentage | 9016 |
Same as above but substitute firebox area for grate area | 30,443 |
Power L1 | 10,310 |
Power MT |