The railroads serving the Port of New York owned and operated fleets of ferries, tugboats and barges to move freight and people from place to place within the vast harbor. Instead of the switching tracks found in other cities, New York was said to have "a water belt line" connecting all steamship piers and waterfront terminals. The marine operations including terminals and floatbridges of the B&O, CNJ, DL&W, Erie, LV, LIRR, NYC, NH, PRR and independent Brooklyn terminal railroads are vividly illustrated and explained by noted marine expert Tom Flagg.