Question: Milan, Washington is located along a railroad that operated until what year?

Context paragraphs:
Kavanaugh, Kentucky: Kavanaugh, Kentucky is an unincorporated community located in Boyd County, Kentucky, located along U.S. Route 23 directly north of the Lawrence County line.  In 1984, the original alignment of U.S. 23 was replaced with a modern four-lane highway.  CSX Transportation's Big Sandy Subdivision railroad tracks pass through the community.  The railroad was formerly operated by the Chessie System and its predecessor the Chesapeake and Ohio Railway Company.

Baker Woodframe Elevator: The Baker Woodframe Elevator is a historic grain elevator in Baker, Oklahoma.  The wood frame elevator was built for the Kimber Milling Company in 1926.  The elevator was located along the Beaver, Mead, and Englewood Railroad, which was extended to Baker the same year the elevator was constructed.  The railroad shipped wheat harvested in Baker to the Gulf Coast.  The elevator operated until 1973, when the railroad ended its service to Baker.

Glen Frazer, California: Glen Frazer, formerly known as Frazerville, is an unincorporated farming community in Contra Costa County, California, United States.  It is located 8 mi north of Orinda, at an elevation of 295 feet (90 m).  It was the name of the train station used by the Santa Fe Railroad (formerly, Atchison, Topeka and Santa Fe Railroad).  It is located along Franklin Canyon Road about 100 yards east of McHarry Ranch Rd.  The sign marking the location of the old station disappeared in the mid 1990's and was near the town of Martinez, CA.  The BNSF Railway still runs along the canyon and past this location.  The train rightofway was donated to the Santa Fe Railroad by the George Frazer (he received a train pass used once to go to S F), but there never was a person named Glen Frazer.  It was named Glen because it sat in a glen.

Dubuque Freight House: The Dubuque Freight House is a historic building located in Dubuque, Iowa, United States.  Built by the Chicago, Burlington and Northern Railroad (CB&N) in 1901, this was the third and last freight house built by a railroad in the Ice Harbor area.  The other two facilities were built by the Illinois Central Railroad (1872) and the Chicago, Milwaukee and St. Paul Railroad (1874).  These other two railroads were older, larger, and monopolized the bridge and tunnel that crossed the Mississippi River.  The CB&N was fortunate that their freight house was located along the water's edge in that the river boats could tie up next to the building and load and unload cargo, and the railroad put box cars on ferries that docked in the Ice Harbor.  The Dubuque Boat and Boiler Works were headquartered on the west end of the facility for 20 years beginning in 1952.  Founded in 1852 as the Iowa Iron Works, they provided engines, boilers and other equipment for river boats, and water craft for the United States Navy, United States Coast Guard, and the United States Army Corps of Engineers.  The building was listed on the National Register of Historic Places in 1979.  It is now a part of the National Mississippi River Museum & Aquarium.

Burlington Northern Railroad: The Burlington Northern Railroad (reporting mark BN) was a United States-based railroad company formed from a merger of four major U.S. railroads.  Burlington Northern operated between 1970 and 1996.

Milan, Washington: Milan ( ) is an unincorporated community in Spokane County, Washington, United States.  Milan is a rural community located along the Burlington Northern Railroad, east of Deer Park.  It is named after the Italian city of Milan.

North Platte Canteen: The North Platte Canteen (also known as the Service Men’s Canteen in the Union Pacific Railroad station at North Platte) was a railroad stop manned by local citizens of North Platte, Nebraska, United States that operated from Christmas Day 1941 to April 1, 1946.  Its purpose was to provide refreshments and hospitality to soldiers who were traveling through the area on the way to war during their ten- to fifteen-minute stopovers.  It was located along the tracks of the Union Pacific Railroad.

Passumpsic Railroad: The Passumpsic Railroad is located in Barnet, Vermont.  The railroad has the only operable steam locomotive in Vermont.  Their steam engine is a two-truck Heisler that ran on the Phoenix marble railroad.  The Passumpsic Railroad is owned by Marvin Kendall and is located along route 5 south of St. Johnsbury.

Milan Railroad Depot: Milan Railroad Depot, also known as the Quincy, Missouri & Pacific Railroad Depot, is a historic train station located at Milan, Sullivan County, Missouri.  It was built in 1882 by the Quincy, Missouri, and Pacific Railroad.  It is a one-story, rectangular frame building with American Craftsman design elements.  It features a hipped roof with wide eaves supported by heavy curved brackets and a projecting telegraphers bay.  The depot remained in operation until 1939 and is operated by the Sullivan County Historical Society as a railroad museum.

Connecticut River Railroad: The Connecticut River Railroad was a railroad located along the Connecticut River in western Massachusetts, formed in 1845 from the merger of two unfinished railroads.  Its main line from Springfield to East Northfield, Massachusetts, opened in stages between 1845 and 1849.  It built several branches and over the years acquired additional lines in Vermont.  The railroad was acquired by the Boston and Maine Railroad in 1893.

Supporting paragraphs: Milan, Washington Burlington Northern Railroad
Answer: 1996