Apparently all converted to std gauge by 1900, except [[Port Huron through Memphis to Almont) according to the following link [[with said route in green on map):
http://www.pmhistsoc.org/narrow.shtml
When I lived in the Thumb, PM was still operating as C&O. Years ago, my uncle got me a ride in the caboose. Wow, what a thrill for this country kid!!
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