Chicago, St. Paul, Minneapolis, & Omaha Ry., Class "M-1" 0-6-0 #18
Taken Spooner, Wis. circa 1952.
During the time that I was paying attention to such things, (1942 to the end of steam) , I never saw an M-1 class switcher in operation at Spooner. #18 appeared late in the game and was probably on its way to the scrap yard. The main and eccentric rods have been removed to eliminate a lot of friction in moving pistons and valves while the engine was being deadheaded. Note also that the front cylinder head is missing. The main difference between the M-1's and later switchers is that the M-1's had a long narrow between the drivers firebox while the later ones all had wide, above the drivers fireboxes. Note that the early Baker valve gear has the combination lever attached directly to the bell crank with the union link extending forward to the cross head rather than having it attached to the valve rod as in later practice. (The difference probably shows up best on 2-8-2 #409.)
Series...........................#9,18,37,45.
Cylinders, Dia. & Stroke=........... 18" X 24" ~ Rigid wheel base = ........................ 11'-0"
Driving wheel Diameter =.....................51" ~ Driving wheel base = ....................... 11'-0"
Valve Piston,...................................11" ~ Engine wheel base = ...... ...................11'-0"
Valve gear, = ...... Baker, (early) Long frame. ~ Wheel base, Eng/Tend.=................. . 41'-10"
Boiler Pressure,............................190 lb. ~ Overall length, eng./tend............. = 58'-0,1/2"
Grate Area =.......................... 21.85 sq. ft. ~ Overall Height ...............................14'-9"
Firebox, L. & W. =................82" X 38,3/4". ~ Width over cylinders = ........................9'-1"
Boiler Dia. first ring = .............60,1/8" O.D.". ~ Wt. on Drivers =........................131,500 lb
Height to boiler center = ..................8'-5,1/2" ~ Wt. of total Engine =..................131,500 lb.
Length over tube sheets= .................11'-10". ~ Minimum curve =.... 35 degrees. or 168' radius.
Evaporative Htg. Surface =........1375.0 sq. ft. ~ Tender wt., loaded =.....................71,900 lb
Htg. Surface, tubes =.............1236.8 sq. ft. ~ Tender capacity, Water = ..............5,500 gal.
Htg. Surface, firebox =.............122.8 sq. ft. ~ Tender capacity, Coal =.....................8 tons.
Htg. Surface, Arch tubes =..........15.4 sq. ft. ~ Journals, Driver =.................. 8" X 10" long
Superheater surface,........................none. ~ Journals, tender =................... 5" x 10" long
Ratio, Htg. Surface to Grate area=....... 62.93 ~ Tractive force =..........................24.624 lb.
Ratio Htg. Surface to cyl. volume =.... 179.28 ~ Factor of Adhesion =........................ 5.34
Ratio T.F. to boiler Pressure =........... 129.6 ~ Wt on Drivers/ engine wt.=................. 100%
Air pump = one 9,1/2" single stage Westinghouse
Built by Alco/Schenectady, C/N 50932, 4/12. Delivered 4/15/12.
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