Lehigh Valley Other Articulated Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Janus (Locobase 16400)

Data from Zerah Colburn (ed.), "Double-Bogie Locomotives for the Central Pacific Railway", Engineering, Volume 8, No 3 (16 July 1869), p. 35. See also Alexander Mitchell comments in Walton W Evans, "American and Fairlie Engines", Railroad Gazette, Volume 9 (30 September 1877), pp. 528-529.

Colburn's title reflects the original destination for this Double-Fairlie locomotive, but the Central Pacific refused delivery and the locomotive sat in Taunton, Mass for two years before the Lehigh Valley was persuaded to buy it. It was the LV that named the twinned cab, twinned firebox design after the Romans' two-headed god, who looked both into the past and into the future.

If he looked ahead, he would have seen that within a year, the Janus had aroused a strongly negative review from the LV's General Superintendent Alexander Mitchell. He wrote in an 18 July 1872 letter to W W Evans: "The Fairlie Engine 'Janus' has not satisfied me of her superior qualities over the old system ...I indorse [sic] statement of trial made on a steep grade, where with 130 lbs pressure, she developed 13 1/2 tons net tons tractive power, the eight-wheeled connected 20 x 24 in cylinders [the Consolidation layout recently devised by Mitchell and Baldwin Locomotive Company] developing 11 1/2 tons. The steam pipes have given much trouble from leakage, and I question their ever being kept tight. They are not to be depended on ... Could not recommend their adoption by any person or company" [ellipses in the original, which was excerpted by Evans].

So, despite reports of good work as a pusher and enjoying popularity among enginemen, the Janus enjoyed only a short career before being wrecked in 1877.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID16,400
RailroadLehigh Valley
Number in Class1
Road Numbers164
Number Built1
BuilderWilliam Mason
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)108,000 / 48,988
Engine Weight (lbs / kg)108,000 / 48,988
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)108,000
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) 2.50 / 2.30
Minimum weight of rail (calculated) (lb/yd / kg/m)30 / 15
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)140 / 9.70
High Pressure Cylinders (dia x stroke) (in / mm)15" x 24" / 381x610 (4)
Tractive Effort (lbs / kg)30,600 / 13879.94
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.53
Heating Ability
Firebox Area (sq ft / m2)125 / 11.61
Grate Area (sq ft / m2)25 / 2.32
Evaporative Heating Surface (sq ft / m2)1775 / 164.90
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1775 / 164.90
Evaporative Heating Surface/Cylinder Volume180.80
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3500
Same as above plus superheater percentage3500
Same as above but substitute firebox area for grate area17,500
Power L12396
Power MT293.46

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