Illinois Central 4-4-2 "Atlantic" Type Locomotives

Class 1000 (1) (Locobase 7048)

Data from table in AERJ July 1903. Works numbers were January 1902.

John S Ingles (in Drury (1993)) tells us that this locomotive was procured to be compared against a single Atlantic delivered by Baldwin in the same year. After a year of trials, the Atlantic layout won, but Rogers produced the batch.

This single Prairie was converted into a 4-6-2 and took the number of the experimental Atlantic.

Class 1002 (Locobase 4095)

Data originally taken from a table in Paul T Warner's article on Atlantics in the Railway & Locomotive Historical Society Bulletin #62 (1943, p 20), but Locobase was supplied the 1913 IC Locomotive Diagram book in May 2005 by Allen Stanley from his extensive collection. That data is the information in the specs.

Warner gave a total heating surface of 3,232 sq ft and a grate area of 50.7 sq ft. The 1913 book shows that the first two batches (1002-11 - works #5920-5939 - and 1012-1021 - works 6115-6119, 6205-6209, 5931) arrived in 1903-1904. (Note that the builder's numbers reflect the last entries by Rogers under its own sequence; Alco soon combined all of its works in a single series.)

One of a few 4-4-2 classes to operate west of the Appalachians. For some reason, 5 more Atlantics had 54 fewer boiler tubes of the same diameter; see Locobase 6551.

Westcott (1960) shows that these were later superheated, fitted with Baker valve gear, 80" drivers, and 21" diameter cylinders; see Locobase 8408. Still later 11 of the class were fitted with 63 1/2" drivers for light freight (not a typical application for the arrangement). They were renumbered 2000-2010. Most Atlantics were scrapped in the 1940s.

Class 1002-1026 - superheated (Locobase 8408)

Data from IC 9 -1928 Locomotive Diagram book supplied in May 2005 by Allen Stanley from his extensive collection.

When the IC superheated its Atlantics, it took the 20 from 1002 class (Locobase 4095) and the 5 from the 1023 (Locobase 6551) and revamped them according to a common design. In addition to a modest amount of superheat, the shops installed outside Baker valve gear actuating 12" piston valves, and increased the cylinder diameter by an inch.

Class 1022 (Locobase 6551)

Locobase 4095 describes the first 20 Atlantics delivered to the IC in 1903-1904. For some reason, the last five (works #6233-6237) delivered (the first in 1903, the others in 1904) had fewer tubes in the boiler and a smaller grate. They were otherwise identical. Data from the 1913 IC Locomotive Diagram book in May 2005 by Allen Stanley from his extensive collection.

Like the 1002s, these 5 engines were superheated and acquired the same boiler design as the earlier locomotives; see Locobase 8408.

Specifications
Class	1000 (1)	1002	1002-1026 - superheated	1022
Locobase ID	7048	4095	8408	6551
Railroad	Illinois Central (IC)	Illinois Central (IC)	Illinois Central (IC)	Illinois Central (IC)
Whyte	4-4-2	4-4-2	4-4-2	4-4-2
Road Numbers	1000	1002-1021	1002, 1004-1026	1022-1026
Gauge	Std	Std	Std	Std
Builder	Burnham, Williams & Co	Rogers	Illinois Central	Rogers
Year	1902	1903	1918	1904
Valve Gear	Stephenson	Stephenson	Baker	Stephenson
	Locomotive Length and Weight
Driver Wheelbase	8.50'	7.25'	7.25'	7.25'
Engine Wheelbase	27.75'	27.75'	29'	27.75'
Ratio of driving wheelbase to overall engine wheebase	0.31	0.26	0.25	0.26
Overall Wheelbase (engine & tender)	59.54'	58.71'	60.29'	58.71'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers	95710 lbs	102000 lbs	113000 lbs	101500 lbs
Engine Weight	178600 lbs	188000 lbs	210000 lbs	187000 lbs
Tender Light Weight	147600 lbs	147600 lbs	147600 lbs	147600 lbs
Total Engine and Tender Weight	326200 lbs	335600 lbs	357600 lbs	334600 lbs
Tender Water Capacity	7000 gals	7000 gals	7000 gals	7000 gals
Tender Fuel Capacity (oil/coal)	15 tons	15 tons	15 tons	15 tons
Minimum weight per yard of rail on which locomotive could run	80 lb rail	85 lb rail	94 lb rail	85 lb rail
	Geometry Relating to Tractive Effort
Driver Diameter	79"	79"	79"	79"
Boiler Pressure	200 psi	200 psi	200 psi	200 psi
Cylinders (dia x stroke)	20" x 28"	20" x 28"	21" x 28"	20" x 28"
Tractive Effort	24101 lbs	24101 lbs	26572 lbs	24101 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)	3.97	4.23	4.25	4.21
	Heating Ability
Firebox Area	174.70 sq. ft	179.70 sq. ft	208.20 sq. ft	177 sq. ft
Grate Area	51 sq. ft	51 sq. ft	50.90 sq. ft	47.60 sq. ft
Evaporative Heating Surface	3192	3075	2525	2709
Superheating Surface			495
Combined Heating Surface	3192	3075	3020	2709
Evaporative Heating Surface/Cylinder Volume	313.52	302.03	224.95	266.08
	Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation	10200	10200	10180	9520
Same as above plus superheater percentage	10200	10200	12216	9520
Same as above but substitute firebox area for grate area	34940	35940	49968	35400
Power L1	10515	10277	18817	9296
Power MT	484.41	444.25	734.24	403.83