New York Central & Hudson River 4-2-4 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Niagara (Locobase 15622)

Data from NYC 8 - 1917 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

These were inspection engines rebuilt at West Albany (25 and 29) and Depew (27) in April-May 1914. Niagara (27) came first in April followed by Mohawk (29) and Catskill (25). Mohawk had originally been delivered in July 1892, Niagara in August 1896, and Catskill in October 1897. In the 1902 diagram book, these were described as "pony engines".

The diagram shows the outline of a 19th Century boiler from which the rear driving axle of two had been removed. In place of the separate tender, a short extension carried by two axles was joined to the engine with heavy bracing. A cabin with four windows on each side shrouded all of the boiler. The inspection party sat to either side of the boiler ahead of the firebox. (Locobase has often wondered just how hot these quarters became.)

Specifications by Steve Llanso of Sweat House Media
Locobase ID15,622
RailroadNew York Central & Hudson River (NYC)
Number in Class3
Road Numbers25, 27, 29
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)
Engine Wheelbase (ft)27.35
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft)27.35
Axle Loading (Maximum Weight per Axle) (lbs)24,000
Weight on Drivers (lbs)24,000
Engine Weight (lbs)85,500
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)85,500
Tender Water Capacity (gals)1500
Tender Fuel Capacity (oil/coal) (gals/tons) 3.50
Minimum weight of rail (calculated) (lb/yd)40
Geometry Relating to Tractive Effort
Driver Diameter (in)64
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)12" x 16"
Tractive Effort (lbs)4896
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.90
Heating Ability
Firebox Area (sq ft)68
Grate Area (sq ft)12
Evaporative Heating Surface (sq ft)577
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)577
Evaporative Heating Surface/Cylinder Volume275.50
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1920
Same as above plus superheater percentage1920
Same as above but substitute firebox area for grate area10,880
Power L17472
Power MT686.37


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