Seaboard Air Line 2-10-2 "Santa Fe" Type Locomotives

Class B (Locobase 9378)

Data from SAL 1929 locomotive diagrams supplied in May 2005 by Allen Stanley from his extensive collection. Baldwin works numbers were 47802, 47867, 47923, 47946 in February 1918; 48072-48073, 48197-48198 in March and 48288-48289 in April.

These were not USRA Santa Fes (for those SAL engines, see Locobase 5008), but a somewhat smaller design with taller drivers. And the SAL operated these as mainline freighters out of Hamlet that pulled trains to Charlottesville and Rutherfordton. Like the B-1s, however, these encountered problems with counterbalancing 5 sets of drivers and the class was rebuilt with disks later on.

Note: Drawings do not show superheating surface area, although it does show flue area. The superheat area is a calculated estimate based on similar boilers in other locomotives in Locobase.

Class B1 (Locobase 5009)

Much of the data comes from http://www.dnaco.net/~gelwood/other/sal-steambk.html for 1929 locomotive diagrams. Works numbers were 52121 in July 1919 and 52158-52162, 52184-52187, 52220-52224 in August.

USRA light Santa Fes which Albert M. Langley, Jr and W. Forrest Beckum, Jr (in Drury (1993)) note were found to be "slow and hard on the track and were banished to the Atlanta-Birmingham line." They add, however, that later efforts to change the counterbalancing while switching the drivers to disks seem to have paid off. In fact, these USRAs retired several years after the initially more satisfactory Bs, running until 1950-1953.

Firebox heating surface included 34 sq ft of arch tubes.

Specifications
Class	B	B1
Locobase ID	9378	5009
Railroad	Seaboard Air Line (SAL)	Seaboard Air Line (SAL)
Whyte	2-10-2	2-10-2
Road Numbers	400-409 / 2400-2409	2485-2499
Gauge	Std	Std
Builder	Baldwin	Baldwin
Year	1918	1919
Valve Gear	Southern	Southern
	Locomotive Length and Weight
Driver Wheelbase	22.50'	21'
Engine Wheelbase	41.50'	40.33'
Ratio of driving wheelbase to overall engine wheebase	0.54	0.52
Overall Wheelbase (engine & tender)	79.52'	75.96'
Axle Loading (Maximum Weight per Axle)	52000 lbs	56500 lbs
Weight on Drivers	240000 lbs	276000 lbs
Engine Weight	334000 lbs	352000 lbs
Tender Light Weight	194000 lbs	188300 lbs
Total Engine and Tender Weight	528000 lbs	540300 lbs
Tender Water Capacity	10000 gals	10000 gals
Tender Fuel Capacity (oil/coal)	17 tons	16 tons
Minimum weight per yard of rail on which locomotive could run	80 lb rail	92 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	63"	57"
Boiler Pressure	190 psi	200 psi
Cylinders (dia x stroke)	29" x 32"	27" x 32"
Tractive Effort	68989 lbs	69575 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.48	3.97
	Heating Ability
Firebox Area	341 sq. ft	373 sq. ft
Grate Area	70.40 sq. ft	79.30 sq. ft
Evaporative Heating Surface	4153	4666
Superheating Surface	1075	1085
Combined Heating Surface	5228	5751
Evaporative Heating Surface/Cylinder Volume	169.76	220.03
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	13376	15860
Same as above plus superheater percentage	16185	18873
Same as above but substitute firebox area for grate area	78396	88774
Power L1	12667	14601
Power MT	581.79	583.15