Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 44., p. . Works numbers were 38301-38302 in September 1912.
The ultra-narrow gauge service of the Mogyana called for a Mogul design used by several such railways. The 1912 pair had a higher boiler pressure than most of the others and burned either coal or wood. The firebox staybolts and the dry pipe were both made of copper.
The 12 later worked for the Usina Santa Teresa sugar plantation.
Data from "Narrow Gauge 'Mogul' for Brazil," The Locomotive & Railway Carriage & Wagon Review, Vol IV (February 1899), p. 27. from Baldwin Locomotive Works Specification for Engines, as digitized by the DeGolyer Library of Southern Methodist University, Volumes 21, p. 66 and 23, p. 166. (Many thanks to John Browning, whose 4 June 2016 email reported an incorrect citation of the Baldwin spec volume.) Works numbers were 15511 in August 1897 and 18471 in December 1900.
The 26 appeared in Locomotive Magazine as an example of Baldwin's narrow-gauge work, It was a powerful little locomotive with a surprisingly high boiler pressure. The firebox contained combustion tubes. The 25 joined the 26 more than three years later.
Baldwin's spec reported that the railway presented "long grades of 3%. Curves at crossing 40 metres radius." (Mainline curves could be as tight as 50 metres radius.) Rail weight was 12 kg/metre (24 lb/yard). The later spec added that the locomotive was expected to haul 80 tons under these conditions.
Tender water and coal capacity equated to available supplies. The 1,000 US gallons of water was deemed sufficient to allow 15 km (9.3 miles) between water tanks, while coal capacity allowed for 80 km (49.7 miles).
A 16 March 1901 letter from Mogyana's E Stevenson reported that "this engine gave perfect satisfaction."
After years of service as 26, then 1, the little 2-6-0 was carted across the Atlantic to Wales and the Ffestiniog Railway. As of 2006, the engine was being restored at the Brecon Mountain Railway shops At the same time, the BMR was planning to build two new locomotives from the original Baldwin plans.
Principal Dimensions by Steve Llanso of Middle Run Media | ||
---|---|---|
Class | 174 | 26 |
Locobase ID | 13966 | 10110 |
Railroad | Mogiana | Mogiana |
Country | Brazil | Brazil |
Whyte | 2-6-0 | 2-6-0 |
Number in Class | 2 | 2 |
Road Numbers | 174-175 / 11-12 | 26, 25/1 |
Gauge | 60 cm | 60 cm |
Number Built | 2 | 2 |
Builder | Baldwin | Burnham, Williams & Co |
Year | 1912 | 1897 |
Valve Gear | Walschaert | Stephenson |
Locomotive Length and Weight | ||
Driver Wheelbase (ft / m) | 7 / 2.13 | 7 / 2.10 |
Engine Wheelbase (ft / m) | 12.83 / 3.91 | 12.83 / 3.90 |
Ratio of driving wheelbase to overall engine wheelbase | 0.55 | 0.55 |
Overall Wheelbase (engine & tender) (ft / m) | 33.83 / 10.31 | 28.17 / 8.60 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
Weight on Drivers (lbs / kg) | 38,000 / 17,237 | 35,935 / 16,300 |
Engine Weight (lbs / kg) | 44,000 / 19,958 | |
Tender Loaded Weight (lbs / kg) | 20,000 / 9072 | |
Total Engine and Tender Weight (lbs / kg) | 64,000 / 29,030 | |
Tender Water Capacity (gals / ML) | 1000 / 3.79 | 1000 / 4.55 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | ||
Minimum weight of rail (calculated) (lb/yd / kg/m) | 21 / 10.50 | 20 / 10 |
Geometry Relating to Tractive Effort | ||
Driver Diameter (in / mm) | 33 / 838 | 33 / 838 |
Boiler Pressure (psi / kPa) | 180 / 1240 | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 16" / 305x406 | 12" x 16" / 305x406 |
Tractive Effort (lbs / kg) | 10,682 / 4845.28 | 10,682 / 4845.28 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.56 | 3.36 |
Heating Ability | ||
Tubes (number - dia) (in / mm) | 68 - 2" / 51 | 68 - 2" / 51 |
Flues (number - dia) (in / mm) | ||
Flue/Tube length (ft / m) | 10.79 / 3.29 | 10.79 / 3.29 |
Firebox Area (sq ft / m2) | 42 / 3.90 | 27.44 / 2.55 |
Grate Area (sq ft / m2) | 8 / 0.74 | 7.53 / 0.70 |
Evaporative Heating Surface (sq ft / m2) | 423 / 39.30 | 408 / 37.90 |
Superheating Surface (sq ft / m2) | ||
Combined Heating Surface (sq ft / m2) | 423 / 39.30 | 408 / 37.90 |
Evaporative Heating Surface/Cylinder Volume | 201.97 | 194.81 |
Computations Relating to Power Output (More Information) | ||
Robert LeMassena's Power Computation | 1440 | 1355 |
Same as above plus superheater percentage | 1440 | 1355 |
Same as above but substitute firebox area for grate area | 7560 | 4939 |
Power L1 | 2992 | 2577 |
Power MT | 520.75 | 474.30 |