New Haven 2-10-2 "Santafe" Locomotives

Class Details by Steve Llanso of Sweat House Media

Class L-1 (Locobase 81)

Data from Alfred Bruce, The Steam Locomotive in America (New York: Bonanza Books, 1952), plate 56 between 276-277. Works numbers were 57891-57940 in March-June 1918.

Although counterbalancing problems (inherent in the Santa Fe wheel arrangement and driver size) limited speeds to 25 mph, these engines lasted through World War II because of their pulling power on the New Haven-Maybrook section.

Class L-1 - with 3 syphons (Locobase 8121)

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

Locobase 81 lets us see the Santa Fes as they were when they were new. Locobase 8120 describes those retrofitted with security circulators.

By the time of the diagram, the New Haven had beefed up its Santa Fe's direct heating surface by adding 156 sq ft (14.5 sq m) of thermic syphons. And the diagram makes great claims for the potency of syphons as water evaporators. Each square foot of tube is credited with making 9.29 lb/hour steam per hour. The larger flues come in at 10.44 lb/hour. But the syphons perform at 55 lb/hour/sq ft, the same as the firebox as a whole.

As a result, maximum water evaporation reached 62,060 lb/hour; 23,100 lb/hour (37.2%) of the total came from direct heating surfaces. Steam consumption by those large cylinders was calculated at 67,500 lb/hour and boiler factor at that rate was 91.8%.

Class L-1 - with 4 circulators (Locobase 8120)

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

Locobase 81 shows the original configuration of these low-drivered Santa Fes. The current entry details one of two upgrades applied to the class later in its career. "Security circulators" were T-shaped water tubes that extended into the firebox and added (in this case) 54 sq ft of heating surface to the firebox. Although quite different from the layout created by the installation of thermic syphons in locomotives described in Locobase 8121, the water evaporation rate wasn't that different. The maximum rate of 60,625 lb/hour included 18,535 lb/hour (30.6%) from direct heating surfaces, a lower percentage that that achieved by thermic syphons. In any case, the boiler could be overmatched by maximum steam consumption demands of 67,500 lb/hour, which yielded an 89.8% boiler factor.

Specifications by Steve Llanso of Sweat House Media
ClassL-1L-1 - with 3 syphonsL-1 - with 4 circulators
Locobase ID81 8121 8120
RailroadNew Haven (NYNH&H)New Haven (NYNH&H)New Haven (NYNH&H)
CountryUSAUSAUSA
Whyte2-10-22-10-22-10-2
Road Numbers3200-32493200-32493206-07, 3238, 3244-3245
GaugeStdStdStd
BuilderAlco-SchenectadyAlcoAlco
Year191819281938
Valve GearBakerBakerWalschaert
Locomotive Length and Weight
Driver Wheelbase22.50'22.50'22.50'
Engine Wheelbase40.60'40.60'40.60'
Ratio of driving wheelbase to overall engine wheebase 0.55 0.55 0.55
Overall Wheelbase (engine & tender)74.75'74.73'74.73'
Axle Loading (Maximum Weight per Axle)62120 lbs62120 lbs
Weight on Drivers296000 lbs299210 lbs299210 lbs
Engine Weight361000 lbs360735 lbs360730 lbs
Tender Light Weight201200 lbs202000 lbs194000 lbs
Total Engine and Tender Weight562200 lbs562735 lbs554730 lbs
Tender Water Capacity11000 gals11000 gals10000 gals
Tender Fuel Capacity (oil/coal)16 tons16 tons16 tons
Minimum weight of rail (calculated) on which locomotive could run99 lb/yard100 lb/yard100 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"63"63"
Boiler Pressure200 psi200 psi200 psi
Cylinders (dia x stroke)30" x 32"30" x 32"30" x 32"
Tractive Effort77714 lbs77714 lbs77714 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.81 3.85 3.85
Heating Ability
Firebox Area420 sq. ft337 sq. ft
Grate Area82.50 sq. ft82 sq. ft82 sq. ft
Evaporative Heating Surface4729 sq. ft4443 sq. ft4697 sq. ft
Superheating Surface1155 sq. ft1115 sq. ft1468 sq. ft
Combined Heating Surface5884 sq. ft5558 sq. ft6165 sq. ft
Evaporative Heating Surface/Cylinder Volume180.63169.71179.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation165001640016400
Same as above plus superheater percentage198001968020336
Same as above but substitute firebox area for grate area010080083576
Power L101329815717
Power MT0489.91579.02

Photos


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