The Marylander was a Baltimore and Ohio Railroad (B&O) afternoon passenger train between New York City and Washington, D.C., operated by the B&O in partnership with the Reading Railroad and the Central Railroad of New Jersey between Jersey City, New Jersey, and Washington, D.C.. Other intermediate cities served were Philadelphia, Wilmington, Delaware, and Baltimore, Maryland. The Marylander's origin can be traced back to the late 1890s, when the B&O began its famed Royal Blue Line service between New York and Washington. Operating as #524 northbound and #525 southbound, the trains were called the New York Express and the Washington Express, respectively, in the 1910s and 1920s. The Marylander and its predecessors offered a high level of passenger amenities, such as parlor cars with private drawing rooms, full dining car service, deluxe lounge cars, and onboard radio and telephone service. The Marylander made history in 1948 when it was the first moving train to offer onboard television reception. It was one of B&O's faster trains on the route, maintaining a four-hour schedule until its discontinuation in October 1956 due to declining patronage.
First introduced by the Baltimore and Ohio Railroad (B&O) as one of the New York–Washington Royal Blue Line trains in the 1890s, the Marylander began life as Train #524, the New York Express, departing Washington at 1 p.m. Southbound, the Washington Express operated as Train #525 with a mid-afternoon departure from Jersey City.
By the late 1920s, Trains #524 and #525 were among the B&O's ten daily passenger trains in each direction between Washington and New York. On May 29, 1929, the B&O dubbed its mid-afternoon deluxe Washington-New York train the Columbian. By the early 1930s, intense competition from the Pennsylvania Railroad in the New York–Washington market prompted the B&O to air condition the train in 1932, the first railroad to do so. Also introduced were the richly-appointed Martha Washington-series dining cars, celebrated for their decor and fresh Chesapeake Bay cuisine served on Dresden china in ornate cars with glass chandeliers and colonial-style furnishings. Dining car specialties included oysters and Chesapeake Bay fish served with cornmeal muffins. In September 1941, the B&O introduced a new Washington–Chicago all-coach train, calling it the Columbian. The Columbian's former afternoon schedule between New York and Washington was renamed the Marylander.