Usina Allianca 2-4-4 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 15135)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 66, pp. 290+. Works number was 52499 in November 1919.

This small sugar plantation tank's specifications originally envisaged a driven wheelbase of 4 feet, but an inked change added six inches. Its firebox was arranged to burn either coal or wood. Its owner was headquartered at Santo Amaro in Bahia State.

The spec book includes two letters regarding perceived deficiencies in the locomotive and Eddystone's response. FW Weston 's 7 July 1920 letter described four shortcomings:

The strap on the big end of the main rod was too light, being 3/8" (9.5 mm) thinner than the 15/16" (23.8 mm) straps on smaller locomotives.

Sheet metal work on the "Improved" Rushton spark-arresting cabbage stack was too light and had already begun to leak after a few test runs. Thickness should be increased from 1/8" (3.18 mm) to 1/4" (6.35 mm).

Double row of rivets should have been used on the boiler shell's joints, and

Why was the saddle tank replaced by the U-shaped tank? Much welding and cutting was required to fit the new tank on the boiler. Also, the railway had cut two cleaning holes in the tank.

Baldwin's Kenneth Rushton replied with a succinct and mostly unapologetic summary:

The big-end strap's thickness and the stack's sheet metal gauge were standard for this size locomotive. On the latter, Rushton noted that "we can make it anything the customer specifies."

The boiler's riveting was also standard practive as it was "quite a small boiler." Hereafter, the builder would stitch a double row of rivets if asked.

The tank was modified according to "Junior Law" (not sure if this is an ICC regulation or at the behest of some engineer), "but unfortunately we did not provide for the rear sand box."

Rushton also pushed back on the last point:"In reference to the cleaning holes in the tank--as we had no knowledge of these they were not applied."

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID15135
RailroadUsina Allianca
Number in Class1
Road Numbers
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.50 / 1.37
Engine Wheelbase (ft / m)22.33 / 6.81
Ratio of driving wheelbase to overall engine wheelbase 0.20
Overall Wheelbase (engine & tender) (ft / m)22.33 / 6.81
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)31,000 / 14,061
Engine Weight (lbs / kg)47,000 / 21,319
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)47,000 / 21,319
Tender Water Capacity (gals / ML)800 / 3.03
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)2 / 2
Minimum weight of rail (calculated) (lb/yd / kg/m)26 / 13
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x406
Tractive Effort (lbs / kg)6994 / 3172.43
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.43
Heating Ability
Tubes (number - dia) (in / mm)94 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.33 / 2.54
Firebox Area (sq ft / m2)53 / 4.92
Grate Area (sq ft / m2) 9.30 / 0.86
Evaporative Heating Surface (sq ft / m2)455 / 42.27
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)455 / 42.27
Evaporative Heating Surface/Cylinder Volume258.54
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1581
Same as above plus superheater percentage1581
Same as above but substitute firebox area for grate area9010
Power L14637
Power MT659.54

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