Mogiana 2-6-0 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 174 (Locobase 13966)

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.


Class 26 (Locobase 10110)

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
Class17426
Locobase ID13966 10110
RailroadMogianaMogiana
CountryBrazilBrazil
Whyte2-6-02-6-0
Number in Class22
Road Numbers174-175 / 11-1226, 25/1
Gauge60 cm60 cm
Number Built22
BuilderBaldwinBurnham, Williams & Co
Year19121897
Valve GearWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.137 / 2.10
Engine Wheelbase (ft / m)12.83 / 3.9112.83 / 3.90
Ratio of driving wheelbase to overall engine wheelbase 0.55 0.55
Overall Wheelbase (engine & tender) (ft / m)33.83 / 10.3128.17 / 8.60
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)38,000 / 17,23735,935 / 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 / 3.791000 / 4.55
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)21 / 10.5020 / 10
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 83833 / 838
Boiler Pressure (psi / kPa)180 / 1240180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x40612" x 16" / 305x406
Tractive Effort (lbs / kg)10,682 / 4845.2810,682 / 4845.28
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.56 3.36
Heating Ability
Tubes (number - dia) (in / mm)68 - 2" / 5168 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.79 / 3.2910.79 / 3.29
Firebox Area (sq ft / m2)42 / 3.9027.44 / 2.55
Grate Area (sq ft / m2)8 / 0.74 7.53 / 0.70
Evaporative Heating Surface (sq ft / m2)423 / 39.30408 / 37.90
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)423 / 39.30408 / 37.90
Evaporative Heating Surface/Cylinder Volume201.97194.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14401355
Same as above plus superheater percentage14401355
Same as above but substitute firebox area for grate area75604939
Power L129922577
Power MT520.75474.30

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