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 Wheelbase14'
Engine Wheelbase40.08'
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender)84.83'
Axle Loading (Maximum Weight per Axle)64400 lbs
Weight on Drivers193000 lbs
Engine Weight365300 lbs
Tender Light Weight332000 lbs
Total Engine and Tender Weight697300 lbs
Tender Water Capacity18000 gals
Tender Fuel Capacity (oil/coal)16 tons
Minimum weight of rail (calculated)107 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter80"
Boiler Pressure285 psi
Cylinders (dia x stroke)22" x 30"
Tractive Effort43968 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39
Heating Ability
Firebox Area480 sq. ft
Grate Area77.10 sq. ft
Evaporative Heating Surface3815 sq. ft
Superheating Surface1042 sq. ft
Combined Heating Surface4857 sq. ft
Evaporative Heating Surface/Cylinder Volume289.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21974
Same as above plus superheater percentage26588
Same as above but substitute firebox area for grate area165528
Power L144892
Power MT1538.39

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