Chicago, St. Paul, Minneapolis, & Omaha Ry., Class "I-1" 4-6-0 #106

Taken Shell Lake Wis, Summer 1951

By the following summer, #106 was hard at work again with its new paint job and number clearly showing but already worn and dingy. It is shown here pushing a Jordan Ditcher/spreader to improve drainage of the right of way just north of the north crossing at Shell Lake, Wisconsin.

The main difference between the later I-1 class and K-1 class was that the K-1 had 2" larger diameter cylinders but that wasn't readily visible. Cosmetically, the easily recognized difference was that the I-1 class had the main steam pipes coming in through the cylinder saddle while the K-1 had the pipes externally mounted between the smoke box side and the valve chamber top. (see#240)

All of the I-1 and K-1 class with Walschaert valve gear had leading eccentric cranks instead of the nearly universal trailing eccentrics. This made forward gear at the top of the link rather than the normal bottom position. This can clearly be seen in this photo.

Series...........................#101-106, #222, #356-363 ( Walschaert Valve Gear/.

Series...........................#308?-353 (Stephenson valve gear.)

Cylinders, Dia. & Stroke=........ 21" x 26" ~ Overall Height =............................. 15'-5,1/4"

Valve, (Piston)..............................12" ~ Width over Cylinders =....................9'-8,3/4"

Valve Gear= .................Walschaert ~ Rigid wheel base = ............................14'-10"

Driving wheel Diameter =...................63" ~ Engine wheel base = ........................25'-10"

Boiler Pressure,.........................200 lb. ~ Eng length over buffer plates=...... .39'-3,3/8"

Grate Area =.........................46 sq. ft. ~ Wheel base, Eng/Tend.=...............59'-1"

Firebox, L. / W. =.......102,1/8" X 65,1/4". ~ Length Eng. & Tender =...............69'-7,1/2"

Length over tube sheets...................15'-0" ~ Wt. on lead truck ......................41,000 lb.

Tubes, Dia. & No.=2"......................160 ~ Wt. on Drivers =.......................138,000 lb.

Flues, Dia. & No.=5,3/8"...................28. ~ Wt. of total Engine =..................179,000 lb.

Htg. Surface, Tubes................1248.6 sq. ft. ~ Tender Wt., Loaded.................. 143,300 lb.

Htg. Surface, flues.................587.3 sq. ft. ~ Wt. eng. & Tender=..................322,300 lb.

Htg. Surface, Arch tubes =...........24.2 sq. ft. ~ Wt. of Engine, light =................157,200 lb.

Evaporative Htg. Surface, total =.2012.1 sq. ft. ~ Tender Wt., light...................... 64,300 lb.

Superheater surface,(Type "A")... 493.0 sq. ft. ~ Tender capacity, Water = ...........7,500 gal.

Combined Htg. Surface =........2505.1 sq. ft. ~ Tender capacity, Coal =..................15 tons.

Boiler Dia. 1st. ring =.............. 66,3/8" O.D. ~ Tractive force =.........................30,940 lb.

Height of boiler center = ................9'-1,3/4" ~ Factor of Adhesion =.......................... 4.46

Stoker=..............................none ~ Wt on Drivers/ engine wt.=...............77.09%

Air Pump =.. 1, Cr. Cpd. 8,1/2" Westinghouse ~ Ratio, Htg. Sur. to Grate area =.......... 43.74

Minimum Curve = 19 Degrees or 303 ft. radius ~ Ratio TF per lb. boiler Pressure=............154.7

Built by Alco-Schenectady, 12/10, C/N 48953, Deliverd 12/27/10


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