Mike Plakus sent me a photo and wrote
The path in the pic is part of a linear park in and near Celina, OH. The path swerved in tight as pictured when it entered the city limits. Outside of town it parrelleled the tracks at about 60 ft. This was all part of a network of MUT and bike lanes that circumnavigated Grand Lake. Norfolk Southern has no problems allowing a bike trail close to a well used freight line. Note how much space there is to the right. The trail could be (and a few feet behind me is) much farther from the rail line. My guess is 12-15 ft between rail and trail, if that. CSX needs to take some lessons.