A & V / VS & P / Southern 2-10-2 "Santa Fe" Type Locomotives

Class K (Locobase 6083)

Data from the 1926 Alabama & Vicksburg locomotive diagram book supplied in March 2004 by Allen Stanley from his extensive collection.

Five small Santa Fes that were delivered singly at first (BLW#s 51646, 51676, 51698) and as a pair (58017-018); this last pair had Young valve gear when they arrived, but it was soon replaced by Walschaert gear. They were rated a 1,670 tons up a 1% grade at slow speed. Steam was delivered through 14" diameter piston valves.

When absorbed into the Illinois Central, they were given numbers 3100-3104. The IC 4 - 1930 Locomotive Diagrams book (also supplied by Allen Stanley) is the source for the firebox heating surface. Arch tubes contributed 33 sq ft of that total.

Class Ss (Locobase 84)

Some data from Southern Railway diagrams hosted on southern.railfan.net/images/archive/southern/steam_loco_diagrams (viewed September 2002).. Evaporative heating surface information from locomotive diagram book provided in April 2004 from Allen Stanley's extension collection. The superheat surface is an estimate based on several other 2-10-2s with 50 superheater flues each measuring 5 1/2" in diameter and of the same or similar length.

50 built by Baldwin (5000-5054) with a engine weight of 367,000 lb. 25 others built by Richmond for subsidiary CNO&TP, later moved to Southern with numbers 5055-5074. These had max weight of 378,000 lb, slightly higher TE.

Both classes later ran at 200 psi. For later service on the Asheville Division (including the notorious Blue Ridge and Saluda grades), some of these engines were fitted with "floating" front drivers. The arrangement consisted of spherical bearings on the forward end of the side rods and Franklin lateral-motion driving boxes for the front axle.

Class Ss-1 (Locobase 1427)

Firebox had combustion chamber. One of the USRA's two basic "Santa Fe" designs standardized near the end of World War I. These 50 went to the Southern and used on Saluda grade service in western North Carolina. But their longer rigid wheelbase eventually limited them to Knoxville-based service.

Specifications
Class	K	Ss	Ss-1
Locobase ID	6083	84	1427
Railroad	A & V / VS & P (SRS)	Southern (SRS)	Southern (SRS)
Whyte	2-10-2	2-10-2	2-10-2
Road Numbers	470-474	5000-5079	5200-5249
Gauge	Std	Std	Std
Builder	Baldwin	Several	Several
Year	1919	1917	1918
Valve Gear	Stevens	Southern	Southern
	Locomotive Length and Weight
Driver Wheelbase	20.33'	20.59'	21'
Engine Wheelbase	24'	38.67'	40.30'
Ratio of driving wheelbase to overall engine wheebase	0.85	0.53	0.52
Overall Wheelbase (engine & tender)	67.58'	74.80'	75.97'
Axle Loading (Maximum Weight per Axle)	45180 lbs	60100 lbs	60000 lbs
Weight on Drivers	218400 lbs	294400 lbs	276000 lbs
Engine Weight	274720 lbs	370600 lbs	352000 lbs
Tender Light Weight	154000 lbs	176000 lbs	188300 lbs
Total Engine and Tender Weight	428720 lbs	546600 lbs	540300 lbs
Tender Water Capacity	7500 gals	9000 gals	10000 gals
Tender Fuel Capacity (oil/coal)	14 tons	12 tons	16 tons
Minimum weight per yard of rail on which locomotive could run	73 lb rail	98 lb rail	92 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	62.50"	57"	57"
Boiler Pressure	200 psi	190 psi	200 psi
Cylinders (dia x stroke)	26" x 28"	28" x 32"	27" x 32"
Tractive Effort	51484 lbs	71083 lbs	69575 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	4.24	4.14	3.97
	Heating Ability
Firebox Area	257 sq. ft	358.50 sq. ft	373 sq. ft
Grate Area	58.70 sq. ft	88 sq. ft	76.30 sq. ft
Evaporative Heating Surface	3278	5234	4666
Superheating Surface	754	1373	1085
Combined Heating Surface	4032	6607	5751
Evaporative Heating Surface/Cylinder Volume	190.51	229.50	220.03
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	11740	16720	15260
Same as above plus superheater percentage	14088	20064	18312
Same as above but substitute firebox area for grate area	61680	81738	89520
Power L1	13742	15341	14601
Power MT	693.59	574.41	583.15