New Haven 2-6-0 "Mogul" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class K-1 superheated (Locobase 8117)

Data from NH 1962 Steam Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection.

Locobase 813 shows the large class of Moguls delivered to the New Haven as main-line freight engines. Obviously this arrangement, while of decreasing value as a fast freight engine running ahead of the passenger trains, proved highly useful in all kinds of local freight, passenger, even commuter work. So the New Haven removed 137 small tubes in favor of 21 large flues holding a modest amount of superheater area and the cylinders increased 2" in diameter. Walschaert, Baker, and Southern valve gear was fitted depending on sub-class. So compact was the 2-6-0 arrangement that the Southern gear (a variant of the Walschaerts) looks oddly placed outside of the second driving axle.

As so refitted, the Moguls kept on until the end of steam in 1951.

Class K-1-a (Locobase 5870)

Preceding the large K-1 class described in Locobase 813 were these 10, written up in American Engineer & Railroad Journal in 1896.

Clearly, John Henney, the NY,NH & H's Superintendent of Motive Power was satisfied with the design delivered by Schenectady. The K-1s that followed 4 years later (Locobase 813) were almost identical except for having tubes 2 inches longer.

Class K-1-b (Locobase 813)

After 40 were split between by Baldwin and Cooke, a follow-up order of 155 was divided among Baldwin, Alco-Schenectady, and Rhode Island.

According to the 1962 diagram, two principal variants had different tube counts with some fitted with 308 tubes, others with 198 tubes. All seem to have had 15 sq ft of arch tubes contributing to direct heating surface.

These Moguls lasted a long time, some running as late as 1951, because they could run freights fast enough on passenger lines to avoid clogging up the road.

They were delivered with Stephenson gear, but were superheated in 1913; see Locobase 8117.

Specifications by Steve Llanso of Sweat House Media
ClassK-1 superheatedK-1-aK-1-b
Locobase ID8117 5870 813
RailroadNew Haven (NYNH&H)New Haven (NYNH&H)New Haven (NYNH&H)
Number in Class19510195
Road Numbers260-299, 325-479
Number Built10195
Valve GearvariousStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)15.1715.1715.17
Engine Wheelbase (ft)23.2523.2523.25
Ratio of driving wheelbase to overall engine wheebase 0.65 0.65 0.65
Overall Wheelbase (engine & tender) (ft)52.8352.66
Axle Loading (Maximum Weight per Axle) (lbs)41,500
Weight on Drivers (lbs)142,000124,400132,700
Engine Weight (lbs)167,800144,200153,000
Tender Loaded Weight (lbs)134,000
Total Engine and Tender Weight (lbs)287,000
Tender Water Capacity (gals)450045007000
Tender Fuel Capacity (oil/coal) (gals/tons) 8.50 8.50
Minimum weight of rail (calculated) (lb/yd)796974
Geometry Relating to Tractive Effort
Driver Diameter (in)636363
Boiler Pressure (psi)190190200
High Pressure Cylinders (dia x stroke) (in)22" x 28"20" x 28"20" x 28"
Tractive Effort (lbs)34,74028,71130,222
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09 4.33 4.39
Heating Ability
Firebox Area (sq ft)181164.38179
Grate Area (sq ft)30.2230.2230.30
Evaporative Heating Surface (sq ft)164521112076
Superheating Surface (sq ft)290
Combined Heating Surface (sq ft)193521112076
Evaporative Heating Surface/Cylinder Volume133.53207.35203.91
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation574257426060
Same as above plus superheater percentage660357426060
Same as above but substitute firebox area for grate area39,54931,23235,800
Power L1835657476128
Power MT389.19305.55305.42

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