New Haven 4-6-4 "Hudson" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class I-5 (Locobase 187)

Data from 1947 Locomotive Cyclopedia. Works numbers ran 61964-61973 in 1936

Firebox heating surface included 139 sq ft of syphons (3) and 81 sq ft of combustion chamber. The cylinders were fed through 11" piston valves. The New Haven calculated water evaporation at 59,359 lb/hour of which the direct heating surface accounted for 26,400 lb/hour. This could be set against the max consumption of 51,626 lb/hour, yielding a boiler factor of 115%.

Other features included an integral cast frame and roller bearings on the drivers (Timkens on 1401-1404, SKF on the rest) and ASF roller bearings on the leading and trailing trucks.

The Catskill Archive of old writeups about steam locomotives includes a late 1930s article on the I-5 --, accessed 22 January 2007. According to the account, Baldwin's hearty Hudsons responded to a requirement that the new engines be able to muscle 12-car, 830-ton (755-tonne) trains up the Sharon Heights 0.6-0.7% grades at 60 mph.

The New Haven received everything they asked for. Every day 8 of the 10 streamliners worked the Merchant's Limited between New Haven and Boston on 24 daily trips with the other two in repair or reserve. The I-5s were reliable, but their latent power could not be fully exploited because of speed restrictions on the line.

Specifications by Steve Llanso of Sweat House Media
Locobase ID187
RailroadNew Haven (NYNH&H)
Number in Class10
Road Numbers1400-1409
Number Built10
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)14
Engine Wheelbase (ft)40.08
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft)84.83
Axle Loading (Maximum Weight per Axle) (lbs)64,400
Weight on Drivers (lbs)193,000
Engine Weight (lbs)365,300
Tender Light Weight (lbs)332,000
Total Engine and Tender Weight (lbs)697,300
Tender Water Capacity (gals)18,000
Tender Fuel Capacity (oil/coal) (gals/tons)16
Minimum weight of rail (calculated) (lb/yd)107
Geometry Relating to Tractive Effort
Driver Diameter (in)80
Boiler Pressure (psi)285
High Pressure Cylinders (dia x stroke) (in)22" x 30"
Tractive Effort (lbs)43,968
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39
Heating Ability
Firebox Area (sq ft)480
Grate Area (sq ft)77.10
Evaporative Heating Surface (sq ft)3815
Superheating Surface (sq ft)1042
Combined Heating Surface (sq ft)4857
Evaporative Heating Surface/Cylinder Volume289.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21,974
Same as above plus superheater percentage26,588
Same as above but substitute firebox area for grate area165,528
Power L144,892
Power MT1538.39

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