See Locobases 1396-1397 for a description of this stock Baldwin light decapod bought by several railroads in the 1920s. Like the others, this locomotive used 12" (305 mm) piston valves.
The 90 was one of two locomotives built to this specification (the other being Osage Railway's #10 - Locobase 6781) that did not head south from Baldwin. Instead, the Colorado-based Great Western Sugar Company used her to haul 40-50 car trains of sugar beets to factories in Longmont, Loveland, Windsor, Johnstown, and Eaton.
After more than 40 years of service, the GWR sold the 90 to the 4.5-mile (7.25 km) long Strasburg Railroad in 1967 for a reported $50,000. Well after 2010, the 90 remained in regular service on this Pennsylvania museum railroad.
Chris Hohl's 2015 conversation with Strasburg' Kelly Anderson revealed that the Pennsylvania railroad had increased both the tender's coal and water capacities. Anderson said that the open space beneath the coal bunker had been closed in, which allowed a 1,000 US gallon (3,785 litre) increase in water capacity. In addition, the original coal boards on the sides and back of the tender were replaced with taller ones, which increased the coal capacity to 15 tons (13,608 kg).
|Specifications by Steve Llanso of Sweat House Media|
|Number in Class||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.70|
|Overall Wheelbase (engine & tender)||64'|
|Axle Loading (Maximum Weight per Axle)||38000 lbs|
|Weight on Drivers||190000 lbs|
|Engine Weight||212000 lbs|
|Tender Light Weight||161000 lbs|
|Total Engine and Tender Weight||373000 lbs|
|Tender Water Capacity||8000 gals|
|Tender Fuel Capacity (oil/coal)||12 tons|
|Minimum weight of rail (calculated)||63 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||190 psi|
|Cylinders (dia x stroke)||24" x 28"|
|Tractive Effort||46512 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.08|
|Firebox Area||197 sq. ft|
|Grate Area||54.30 sq. ft|
|Evaporative Heating Surface||2343 sq. ft|
|Superheating Surface||553 sq. ft|
|Combined Heating Surface||2896 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||159.81|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||10317|
|Same as above plus superheater percentage||12277|
|Same as above but substitute firebox area for grate area||44542|