Interstate 4-4-0 "American" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Reply to RFP? (Locobase 6075)

Data from 1952 Interstate diagram book provided by Allen Stanley from his extensive Rail Data Exchange in March 2004.

Can't tell anything about when this locomotive came to the Interstate. In fact, it appears that this was a proposal from Baldwin for a single Eight-wheeler that was never actually produced. Firebox heating surface included 12 sq ft of brick arch.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassReply to RFP?
Locobase ID6075
RailroadInterstate (IRR)
Number in Class
Road Numbers
Number Built
Valve GearSouthern
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)23 / 7.01
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft / m)58.83 / 17.93
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)98,000 / 44,452
Engine Weight (lbs / kg)147,000 / 66,678
Tender Loaded Weight (lbs / kg)100,000 / 45,359
Total Engine and Tender Weight (lbs / kg)247,000 / 112,037
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)10 / 9.10
Minimum weight of rail (calculated) (lb/yd / kg/m)82 / 41
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)66 / 1676
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x610
Tractive Effort (lbs / kg)24,727 / 11215.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.96
Heating Ability
Firebox Area (sq ft / m2)168 / 15.61
Grate Area (sq ft / m2)31 / 2.88
Evaporative Heating Surface (sq ft / m2)1780 / 165.43
Superheating Surface (sq ft / m2)376 / 34.94
Combined Heating Surface (sq ft / m2)2156 / 200.37
Evaporative Heating Surface/Cylinder Volume203.97
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6200
Same as above plus superheater percentage7254
Same as above but substitute firebox area for grate area39,312
Power L115,136
Power MT681.00

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Wes Barris