Where crushed limestone trail trail  follow the Chicago, Rock Island and Pacific Railroad, also known as Rock Island Line or The Rock?
Hoover Nature Trail The Hoover Nature Trail (HNT) is a crushed limestone rail trail in eastern Iowa that follows the old Chicago, Rock Island and Pacific Railroad route between Burlington and Cedar Rapids. The trail is a shared-use trail for bicycling, hiking, jogging, walking, cross-country skiing, and nature study and is 24 mi long.
Prairie Marksman The Prairie Marksman was a daily passenger train operated by Amtrak between Chicago's Union Station and East Peoria, Illinois. The route was an indirect successor to the Rock Island's "Peoria Rocket".