Built Mariners Harbor, N. Y. 1929 Length, 251 Ft. 2,026 tons. By 1830 double-ended ferryboats were a standard feature of the American harbor scene. Many still operate today. Though tunnels and bridges have greatly reduced their numbers. This ferry, the Dongan Hills, carries people and cars across New York harbor-between Manhattan and Staten Island. Representing the ultimate development of the typical steam ferry, she has two automobile gangways running from end to end of the main deck. Separated by the engine room enclosure and flanked by cabins ?on the guards? still marked ?Men? and ?Women,? though the sexes no longer travel on opposite sides of the boat. Her upper-deck passenger cabin is finished in wood ?steamboat paneling,? where newer boats have utilitarian metal surfaces. Her reciprocating engines turn a solid shaft with a propeller at each end. The Dongan Hills and nine younger fleet-mates offer one of the world's great transportation bargains: a 25-minute boat ride for nickel.