I doubt that the existing ROW over the central part of this line can support "normal" passenger train speeds. Curves would likely have to be widened between Mt. Pleasant and Cadillac, at the least. (The northern part of the Annie was cobbled together from logging railroads.) While MDOT has funded track maintenance projects on some of the component lines, that's to support freight traffic at "modest" freight speeds. There may be ridership potential, but the cost of preparation is likely to be prohibitively high.
Air service to/from TVC is decent, especially in summer, though crowded and pricey.
