Question: Which is longer, the Raccoon River Valley Trail or the American Discovery Trail
Context: The Valley Trail is a 40 mi long hiking trail in Grand Teton National Park in the U.S. state of Wyoming.  Though the trail can be accessed at numerous trailheads in Grand Teton National Park, the southern terminus is near Teton Village, Wyoming, just outside the park.  Heading north from Teton Village, the Valley Trail flanks the base of the Teton Range and skirts the shores of Phelps, Taggart, Bradley, Jenny, String, Leigh, Bearpaw and Trapper Lakes. Along its 40 mi length, it is sometimes known by other names such as the Jenny Lake Trail or the String Lake Trail. The River to River Trail is a 160 mile (256 km)-long hiking trail that serves Shawnee National Forest in far southern Illinois.  The trail is used by both equestrians and hikers.  About half is on off road trails.  Its eastern terminus has historically been Battery Rock, overlooking the Ohio River but now generally Elizabethtown, Illinois is used as the eastern terminus.  The western terminus is in Grand Tower, Illinois, at the Mississippi River.  Sections of the River to River Trail form part of the Southern Section of the American Discovery Trail. The Bradley Lake Trail is a 4 mi long round-trip hiking trail in Grand Teton National Park in the U.S. state of Wyoming.  The trail is accessed from the Taggart Lake trailhead and provides access to Bradley Lake, with views of the lake and the Teton Range.  At Bradley lake, the trail intercepts the Valley Trail which heads north towards Garnet Canyon or south to Taggart Lake.  Using the Valley Trail and the Taggart Lake Trail, a loop hike starting from the Taggart Lake Trailhead is 5.9 mi long. Raccoon River Valley Trail (RRVT) is a rail trail running 56 mi from Waukee, Iowa, to Jefferson, Iowa.  In 2013, an additional 33.1 mi north loop was completed on the RRVT, making the RRVT nearly 90 mi of paved trails and having a paved interior loop of more than 72 mi .  The 39 mi portion of the trail from Waukee to Herndon is part of the American Discovery Trail, which runs between Cape Henlopen State Park in Delaware and Point Reyes near the Bay Area of California.  In Iowa, the American Discovery Trail will be concurrent with U.S. Bicycle Route 50 (see United States Numbered Bicycle Routes). The Open Canyon Trail is a 8.3 mi long hiking trail in Grand Teton National Park in the U.S. state of Wyoming.  The trail begins at a junction with the Valley Trail and is most easily accessed with a 3 mi hike on the Valley Trail from the trailhead near the White Grass Ranger Station Historic District.  From there the trail heads west from Phelps Lake to Mount Hunt Divide and then descends into Granite Canyon.  The trail traverses the entire length of Open Canyon.  Indian Lake and Coyote Lake as well as Mount Hunt can also be reached from the trail but each require off trail navigation to access.  There are two different camping zones in the canyon which are available by permit. The American Discovery Trail is a system of recreational trails and roads which collectively form a coast-to-coast hiking and biking trail across the mid-tier of the United States.  Horses can also be ridden on most of this trail.  It starts on the Delmarva Peninsula on the Atlantic Ocean and ends on the northern California coast on the Pacific Ocean.  The trail has northern and southern alternates for part of its distance, passing through Chicago and St Louis respectively.  The total length of the trail including both the north and south routes is 6800 mi .  The northern route covers 4834 mi with the southern route covering 5057 mi .  It is the only non-motorized coast-to-coast trail. The Taggart Lake Trail is a 3 mi long round-trip hiking trail in Grand Teton National Park in the U.S. state of Wyoming.  The trail is accessed from the Taggart Lake trailhead and provides access to Taggart Lake, with views of the lake and the Teton Range.  At Taggart Lake, the trail intercepts the Valley Trail which heads north towards Bradley Lake or south to Death Canyon.  Using the Valley Trail and the Bradley Lake Trail, a loop hike starting from the Taggart Lake Trailhead is 5.9 mi long. Minburn Railroad Depot is a historic building located in Minburn, Iowa, United States.  The Des Moines Valley Railroad laid tracks from Des Moines to Fort Dodge in 1869, and the town was established the same year.  A frame building was built for a depot.  The Chicago, Rock Island and Pacific Railroad leased the line in the 1890s, and the Minneapolis and St. Louis Railway took over the line in 1906.  The old depot was destroyed by fire and this brick structure replaced it in 1914.  The last passenger train left the depot on April 19, 1959.  The Chicago and North Western Railway acquired the line in 1960, and the last freight train used the depot the following year.  A restoration process for the depot began in 2007, and it was relocated a short distance from its original location to a new location along the Raccoon River Valley Trail.  It houses a cafe and restrooms for those who use the trail, which is the old railroad right-of-way.  The building was listed on the National Register of Historic Places in 2015. The Grand Valley Trail is 275 km long and runs from Rock Point Provincial Park on Lake Erie which is south of Dunnville to Alton not far from Orangeville where it links by a side trail to the Bruce Trail.  It is managed by the volunteer group, the Grand Valley Trails Association.  Hikers are able to identify the main Grand Valley Trail by the white blazes approximately 5 cm wide by 15 cm high.  The trail is well-maintained and has good relationships with the nearby landowners.  A GVTA Guide Book, 6th ed.  2006 was published but is kept up-to-date by a list of trail and road changes by the affiliated organization. The Cardinal Greenway is a rail trail that encompasses 60 mi of abandoned CSX railroad corridor in east central Indiana.  The trail runs from Richmond to Marion and is the longest rails-to-trails project in Indiana as of 2004 .  The Cardinal Greenway was designated a National Recreation Trail in June 2003 and is an important part of the American Discovery Trail.
Answer: American Discovery Trail