Baldwin 4-10-2 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 60000 (Locobase 419)

Data from Paul T. Warner, "Design and Construction of Locomotive 60,000" (on the Web at [] . The entire report "Locomotive Number 60,000

An Experimental Locomotive" including Warner,'s detailed description, Lawford H Fry, "Discussion of Test Results", and reports of tests on individual railroads is available at [], last accessed 30 August 2021. See also DeGolyer, Volume 77, pp. 826+. (Thanks to Chris Hohl for his 25 October 2021 email that provided the correct total wheelbase.) Works number 60000 in May 1927.

This engine was an anniversary locomotive, built as the 60,000th engine to come out of the Baldwin Works in the same month that Lindbergh flew solo across the Atlantic Ocean to Paris.

It was a compound locomotive with a single HP cylinder inside and watertube boiler, a sufficiently unconventional combination to attract much notice. The firebox had sides made up of 48 4" (102 mm) diameter water tubes. Each flank of tubes connected to a horizontal cylindrical drum on top. Warner claimed:"This construction provides a boiler entirely free of staybolts and from flat surfaces requiring staybolts. This feature of the design gives it an important advantage when high steam pressures are to be carried." The horizontal, 26"-diameter drums ran longitudinally 23 1/2 feet (7.16 m) from the rear face of the firebox into the boiler.

Other features included a Worthington 4-BL feed water heater and pump, three 14" (356 mm) piston valves, and 27 sq ft (2.51 sq m) of direct heating surface area in five arch tubes.

The engine was powerful, but required considerable maintenance and was not duplicated.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID419
Number in Class1
Road Numbers60,000
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)22.83 / 6.96
Engine Wheelbase (ft / m)45.17 / 13.77
Ratio of driving wheelbase to overall engine wheelbase 0.51
Overall Wheelbase (engine & tender) (ft / m)86.94 / 26.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)338,400 / 153,496
Engine Weight (lbs / kg)457,500 / 207,519
Tender Loaded Weight (lbs / kg)243,400 / 110,405
Total Engine and Tender Weight (lbs / kg)700,900 / 317,924
Tender Water Capacity (gals / ML)12,000 / 45.45
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)16 / 15
Minimum weight of rail (calculated) (lb/yd / kg/m)113 / 56.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63.50 / 1613
Boiler Pressure (psi / kPa)350 / 24.10
High Pressure Cylinders (dia x stroke) (in / mm)27" x 32" / 686x813 (1)
Low Pressure Cylinders (dia x stroke) (in / mm)27" x 32" / 686x813
Tractive Effort (lbs / kg)81,969 / 37180.56
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.13
Heating Ability
Tubes (number - dia) (in / mm)206 - 2.25" / 57
Flues (number - dia) (in / mm)50 - 5.5" / 140
Flue/Tube length (ft / m)23 / 7.01
Firebox Area (sq ft / m2)772 / 71.72
Grate Area (sq ft / m2)82.50 / 7.66
Evaporative Heating Surface (sq ft / m2)5192 / 482.35
Superheating Surface (sq ft / m2)1357 / 126.07
Combined Heating Surface (sq ft / m2)6549 / 608.42
Evaporative Heating Surface/Cylinder Volume489.62
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation28,875
Same as above plus superheater percentage34,939
Same as above but substitute firebox area for grate area326,942
Power L137,145
Power MT1209.97

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