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

The I-1 and K-1 10-wheelers were the workhorses of the way freight traffic. Although most major repairs to the Omaha motive power was done at the St. Paul Shops, some of it was parceled out to the division point roundhouses. #106 is shown here with the throttle valve pulled out of the steam dome for refacing the valve. Although it can't be seen in this photo, the smokebox front has also been removed and all of the superheater elements are laid out on a long work bench in front ot it. this repair job was obviously not a rush order as #106 spent most of the winter looking just as it appears in this photo.

Series.........#101-106, #222-225 #354-363 ( Walschaert Valve Gear).

Series...........................#302-353 (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, Delivered 12/27/10