Lake Terminal Other Articulated Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 20 (Locobase 9840)

Data from Lake Terminal RR 1929ca Locomotive Diagrams supplied in May 205 by Allen Stanley from his extensive Rail Data Exchange. See also "A Heavy Switching Locomotive with Side Sandboxes", Engineering News, Volume 69, No 6 (6 February 1913), p. 239; and DeGolyer, Volume 41, p. 65.. Works number was 37349 in November 1911.

This single all-adhesion Mallet entered service to haul loaded cars back and forth to the National Tube Company in Lorain, Ohio. The Engineering News report focused on the provision of two sandboxes on each side of the boiler near the top. So arranged, each sandbox could serve one bank of three drivers. The report also pointed out that "[w]hile the run is short [to National Tube], the operating conditions are severe. Directly after starting, the engine has to pass a curve of 7 deg 48 minutes on a grade of 1.23%, and on the straight track there is a maximum grade of 1.65%.

Although well-suited to the tight curves and alignments, the big lone Mallet was scrapped in 1927.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID9840
RailroadLake Terminal
Number in Class1
Road Numbers20
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)20 / 6.10
Engine Wheelbase (ft / m)29.67 / 9.04
Ratio of driving wheelbase to overall engine wheelbase 0.67
Overall Wheelbase (engine & tender) (ft / m)62.23 / 18.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)350,100 / 158,803
Engine Weight (lbs / kg)350,100 / 158,803
Tender Loaded Weight (lbs / kg)129,900 / 58,922
Total Engine and Tender Weight (lbs / kg)480,000 / 217,725
Tender Water Capacity (gals / ML)7000 / 26.52
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)12 / 11
Minimum weight of rail (calculated) (lb/yd / kg/m)97 / 48.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)55 / 1397
Boiler Pressure (psi / kPa)205 / 14.10
High Pressure Cylinders (dia x stroke) (in / mm)24" x 32" / 610x813
Low Pressure Cylinders (dia x stroke) (in / mm)37" x 32" / 940x813
Tractive Effort (lbs / kg)82,205 / 37287.61
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.26
Heating Ability
Tubes (number - dia) (in / mm)437 - 2.25" / 57
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)21 / 6.40
Firebox Area (sq ft / m2)260 / 24.15
Grate Area (sq ft / m2)78.30 / 7.28
Evaporative Heating Surface (sq ft / m2)5640 / 524.16
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)5640 / 524.16
Evaporative Heating Surface/Cylinder Volume336.57
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation16,052
Same as above plus superheater percentage16,052
Same as above but substitute firebox area for grate area53,300
Power L13275
Power MT123.74

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Wes Barris