Question: The Riverport Railroad operates a former army depot track that was opened in what year?
Context: The Riverport Railroad (reporting mark RVPR) is a switching railroad located in Savanna, Illinois, and operates the former Savanna Army Depot Track.  The company offers services in railcar storage, switching, railcar cleaning and repair (Via the RESCAR company) and Inserv Rail Cleaning Company and transloading services. The Red River Army Depot (RRAD) is an 15835 acre facility located 18 mi west of Texarkana, Texas, in Bowie County.  The facility has over 3000000 sqft of storage capacity.  RRAD was activated in 1941 to create an ammunition storage facility.  The depot was supposed to be deactivated after the findings of the 1995 Base Realignment and Closure Commission.  However, the depot remained open after the commission changed its mind.  The depot was once again slated for closure upon recommendation from the 2005 BRAC commission, but has remained open to provide maintenance support for the army.  The depot's primary mission is the maintenance and repair of all tactical wheeled vehicles, which includes repairing MRAPs and HUMVEEs. Letterkenny Army Depot took over some of RRAD's missile systems. The Dakota, Missouri Valley and Western Railroad (reporting mark DMVW) started operations in September 1990 operating over 360 miles (580 km) of former Soo Line Railroad track in Montana and North Dakota.  The railroad operates approximately 523 miles (893 km) of track.  DMVW's network includes 435 mi of track leased from Canadian Pacific Railway, 13 mi of track from McKenzie, North Dakota, to Moffit, North Dakota, and 75 mi of track from Geneseo, North Dakota, to Aberdeen, South Dakota.  DMVW maintains its headquarters in Bismarck, North Dakota and has field offices in Crosby, North Dakota, Wishek, North Dakota, and Oakes, North Dakota, as well as Britton, South Dakota. Rock and Rail (reporting mark RRRR) is a short line railroad operating in southern Colorado that is a subsidiary of Martin Marietta Materials.  The railroad began in 1998, using track originally built by the Denver and Rio Grande Western Railroad that was disused after their merger with the Union Pacific Railroad (UP).  The track operated by Rock and Rail between Parkdale and Cañon City is still owned by the UP, while the track between Pueblo and Cañon City was purchased from the UP.  The tourist line Cañon City and Royal Gorge Railroad operates on the RRRR's track. The Delmarva Central Railroad (reporting mark DCR) is an American short-line railroad owned by Carload Express that operates 161.59 mi of track on the Delmarva Peninsula in the states of Delaware and Maryland.  The railroad operates lines from Porter, Delaware to Pocomoke City, Maryland and from Harrington, Delaware to Frankford, Delaware along with several smaller branches.  The DCR interchanges with the Norfolk Southern Railway, the Maryland and Delaware Railroad, the Bay Coast Railroad, and the Delaware Coast Line Railroad.  The railroad was created in 2016 to take over the Norfolk Southern Railway lines on the Delmarva Peninsula. The Everett Railroad is a short-line railroad that operates ex-Pennsylvania Railroad trackage in the Hollidaysburg area of the U.S. state of Pennsylvania.  It runs freight trains over two separate lines, one from Brooks Mill and Sproul, and the other, owned by the Morrison's Cove Railroad, from Roaring Spring to Curryville and Martinsburg.  The affiliated Hollidaysburg and Roaring Spring Railroad , which the Everett Railroad operates both under contract and via trackage rights, connects the two segments to each other and to the Norfolk Southern Railway (ex-Conrail) in Hollidaysburg.  The Everett Railroad name refers to its former location near Everett, abandoned in 1982. Savanna Army Depot was a 13062 acre installation, located on the eastern bank of the Mississippi River, in Carroll and Jo Daviess counties, around 7 mi north of Savanna, Illinois.  It was opened in 1917 as a proving and testing facility for weapons developed at Rock Island Arsenal.  In 1921 it became a weapons depot.  The U.S. Environmental Protection Agency (EPA) listed the depot as a Superfund site in 1989.  The depot was selected for closure through the Base Realignment and Closure process in July 1995 and was officially closed on March 18, 2000.  The Jo-Carroll Local Redevelopment Authority (LRA) was established to redevelop a portion of the property for commercial and business usage referred to as the Savanna Depot Park.  On September 26, 2003, the United States Department of Defense agreed to transfer 9404 acre of land to become the Lost Mound Unit of the Upper Mississippi River National Wildlife and Fish Refuge.  3022 acre were initially transferred with the rest to be transferred following environmental cleanup.  The portion near Lock and Dam No. 12 was transferred to the United States Army Corps of Engineers and a small part to the Illinois Department of Natural Resources. Lexington Army Depot is a former United States Army facility located in Avon, Kentucky.  In 1964, it was paired with Blue Grass Army Depot to form Lexington-Blue Grass Army Depot.  In 1999, the facility was closed after the recommendation of the 1988 Base Realignment and Closure Commission. Pueblo Depot Activity "(PUDA)", formerly known as the Pueblo Ordnance Depot and the Pueblo Army Depot, was a U.S. Army ammunition storage and supply facility.  Responsibility for the depot fell upon the U.S. Army Ordnance Corps, and the first civilians were hired in 1942 as operations began.  The mission quickly expanded to include general supplies as well.  It is a 24202 acre site located 14 mi east of Pueblo, Colorado.  In 1945 they began to receive mass amounts of equipment returning from the combat theaters of World War II.  Therefore, the mission expanded yet again to include the maintenance and refurbishing of artillery, fire control, and optical material.  In 1951 the depot assumed responsibility to distribute U.S. Air Force ammunition for an eight-state area, as well as storage of strategic and critical materials for the General Services Administration (GSA).  They were also tasked to rebuild and provide on-site maintenance support for guided missiles, ensure calibration and maintenance of electronic test equipment and radio-controlled aerial targets.  They would also provide specialized training for new Army equipment as needed.  In 1952, Rocky Mountain Arsenal in Denver, Colorado transferred chemical agents and chemical munitions to Pueblo Army Depot for secure storage.  In 1974 Pueblo Army Depot was redesignated as Pueblo Depot Activity. Founded in 1996, the Naugatuck Railroad is a common carrier railroad owned and operated by the Railroad Museum of New England on tracks leased from the Connecticut Department of Transportation.  The original Naugatuck Railroad was a railroad chartered to operate through south central Connecticut in 1845, with the first section opening for service in 1849.  In 1887 the line was leased by the New York, New Haven and Hartford Railroad, and became wholly owned by 1906.  At its greatest extent the Naugatuck ran from Bridgeport north to Winsted.  Today's Naugatuck Railroad runs from Waterbury to the end of track in Torrington, Connecticut.  From Waterbury south to the New Haven Line, Metro-North Railroad operates commuter service on the Waterbury Branch.
Answer: 1917