Eric Charette posted the route:

Original post on ericcharette.blogspot.com/2012/05/greenstone-ridge-trail-fkt.html

Kal-Haven Trail State Park is a 33.5-mile crushed limestone path (former RR bed) connecting South Haven and Kalamazoo. The trail meanders through wooded areas, past farm lands and over rivers and streams. Trail highlights include a camelback bridge and covered bridge. Dating to 1991 and held each year since 2010, the Kal-Haven Trail Run (race) has taken place along the length of the trail.

The Chicago Lakefront Trail is an 18-mile, heavily traveled, multi-use, paved trail along Lake Michigan. It is the annual (since at least 2000) venue for 50 km and 50 mile races, the Chicago Lakefront 50/50.  The course records of these events are probably the best indication of supported "FKTs" for this route.

Wabash Trace Nature Trail is mostly crushed limestone rails-to-trails through southwestern Iowa, running from Council Bluffs on the Nebraska border to Blanchard, Iowa on the Missouri border, approximately 63 miles.

The North/South Trail spans the Land Between the Lakes.  

About Katy Trail State Park, MO

The Katy Trail is a 237 mile (386 km) trail stretching across most of the state of Missouri. (Use this link if you're looking for the Dallas Katy Trail). Over half of it follows Lewis and Clark's path up the Missouri River, where you can ride beneath towering river bluffs while eagles circle overhead. After leaving the river, the trail meanders through peaceful farmland and small-town Americana.

The Mountain-Bay Trail is an 83 mile rails to trails running from Wausau WI to Green Bay WI.
mountain-baytrail.org