arcade was finished in 1899. The arcade was unique to Columbus and consisted of stores and offices built atop the viaduct and facing High Street. An elevated roadway connected High Street to the station to the east. The station increased the number of depot tracks from seven to nine. The architecture of the station drew on Burnham's experience designing the Chicago World's Fair in 1893. The style was Beaux-Arts Classicism, a late 19th-century style often applied to monumental structures. In May 1928, part of the arcade was demolished to expand the driveway to the station to better accommodate automobiles. New York Central moved their Toledo and Ohio Central services back to Union Station in 1930. In April 1931, the train shed was replaced with an enclosed concourse. In 1956, Columbus was down to 42 daily passenger trains, the lowest number since 1875. Daily passenger trains fell to 21 in 1962, and just 10 in 1970. It was clear that the completion of the interstates and popularity of automobiles would soon mean the end of passenger rail service in Columbus. On May 1, 1971, Amtrak took over most of what was left of passenger service in the United States. On January 17, 1974, the station's arcade was listed on the National Register of Historic Places, noted in emergency as plans existed to demolish the structure. Decline and demolition (1976–1979) Amtrak cut back rail service to a single train, the New York-Kansas City National Limited (formerly the Spirit of St. Louis). The restaurant and newsstand were closed. The demolition and replacement of Union Station dates to a 1969-1975 lawsuit against the Columbus-based Battelle Memorial Institute (BMI). The institute was formed as a nonprofit and still operates as one, though its improper profit uses led to the lawsuit. As a result, BMI offered about $80 million for various causes, including $36.5 million to establish a convention center at the site of Union Station. BMI established the Battelle Commons Corporation in 1974 to handle the project. Battelle Commons Corporation applied for grants to create a transit center as part of the convention center, including from the Urban Mass Transit Administration (UMTA) and Federal Highway Administration. The transit center project was supported by the Central Ohio Transit Authority (COTA), Columbus's mass transit agency. The proposed hub, titled TransCenter, was to include 2,000 square feet inside the restored Union Station arcade, containing transit information, ticket offices,