Monongahela 2-8-0 "Consolidation" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class H5 (Locobase 7062)

Data from MNGHLA 12 - 1949 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

One diagram notes that those H5s fitted with thermic syphons add 50 sq ft (4.65 sq m) to the firebox heating surface. That is the version shown in the specs, which also show twelve fewer boiler tubes as a result.

Engine 119 was fitted with a superheater that contributed 570 sq ft (52.95 sq m) to the total heating surface of 2 ,905 sq ft (269.9 sq m). To house the 30 5 3/8" superheater flues, the boiler lost 167 2" tubes. See H5SA (Locobase 7063) for the as-built superheated version of this class.


Class H5SA (Locobase 7063)

Data from MNGHLA 12 - 1949 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange.

Twelve of these superheated Consolidations came from the Pittsburgh Locomotive Works (builder's numbers 55834-55839 and 58658-58663); Porter supplied the 13th (its number 6848).

Principal Dimensions by Steve Llanso of Sweat House Media
ClassH5H5SA
Locobase ID7062 7063
RailroadMonongahelaMonongahela
CountryUSAUSA
Whyte2-8-02-8-0
Number in Class2613
Road Numbers115-140141-153
GaugeStdStd
Number Built2613
BuilderAlco-PittsburghAlco-Pittsburgh
Year19091916
Valve GearBakerBaker
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.25 / 4.3414.25 / 4.34
Engine Wheelbase (ft / m)23.17 / 7.0623.50 / 7.16
Ratio of driving wheelbase to overall engine wheebase 0.62 0.61
Overall Wheelbase (engine & tender) (ft / m)63.67 / 19.4158.25 / 17.75
Axle Loading (Maximum Weight per Axle) (lbs / kg)45,600 / 20,68447,050 / 21,342
Weight on Drivers (lbs / kg)170,300 / 77,247178,340 / 80,894
Engine Weight (lbs / kg)193,600 / 87,816201,390 / 91,349
Tender Loaded Weight (lbs / kg)138,000 / 62,596150,000 / 68,039
Total Engine and Tender Weight (lbs / kg)331,600 / 150,412351,390 / 159,388
Tender Water Capacity (gals / ML)7000 / 26.528500 / 32.20
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 12.7017 / 15.50
Minimum weight of rail (calculated) (lb/yd / kg/m)71 / 35.5074 / 37
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 129551 / 1295
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 30" / 533x76222.5" x 30" / 572x762
Tractive Effort (lbs / kg)44,100 / 20003.4550,625 / 22963.14
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.86 3.52
Heating Ability
Firebox Area (sq ft / m2)239 / 22.20166 / 15.43
Grate Area (sq ft / m2)51.70 / 4.8051.70 / 4.80
Evaporative Heating Surface (sq ft / m2)3029 / 281.402335 / 217.01
Superheating Surface (sq ft / m2)570 / 52.97
Combined Heating Surface (sq ft / m2)3029 / 281.402905 / 269.98
Evaporative Heating Surface/Cylinder Volume251.86169.13
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation10,34010,340
Same as above plus superheater percentage10,34012,408
Same as above but substitute firebox area for grate area47,80039,840
Power L1597110,214
Power MT309.19505.06

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