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I used to hang around Lapeer Jct. tower at Lapeer that protected the East-West GTW Flint sub. and the North-South M.C. (NYC) Bay City branch. The tower had an armstrong interlocking machine, a Saxby and Farmer improved model with a twelve lever frame, 8 active and 4 spare levers. The interlocker controlled four home signals and a siding on the Michigan central which required a long throw of the connecting pipe, about 4 hundred feet. The ditch that the pipe ran in would often fill with snow in the winter which gave the maintainer lots of excersize shoveling out the drifts. A good site for Michigan Interlocking photos is Miichiganrailroads.com click on history, then interlockings. There are many drawings of interlockings and photos, BO and Nichols which you mentioned in your post are there.
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