During its years of operation, freight traffic volume on the single-track overseas extension was disappointing, as the anticipated growth in Panama Canal cargo shipping through Key West failed to materialize. Local Key West and online freight consisted of coal, fruit, and building materials. Trains of
tank cars brought potable water to Key West from mainland Florida. Before the
Great Depression hit, passenger traffic consisted of both local and long distance trains. In 1929, the
Havana Special was the premier train, providing year-round coach and sleeping car service between New York and Key West, daily except Sundays, with connecting ferry service beyond to the Cuban capital. With speed restricted to on the long bridges, it took a leisurely four and a half hours to travel the distance between Key West and Miami: northbound, the
Havana Special departed Key West at 6 p.m., for a 10:45 p.m. departure from Miami. Another train, the
Over-Sea, operated locally between Miami and Key West during daylight hours, leaving Miami at 11:05 a.m. and arriving at Key West 4:35 p.m. During the winter months, the
Over-Sea consist included a deluxe
parlor-observation car. It was a popular train for vacationers traveling to the various fishing camps in the Keys. The
Caribbean Mail also operated over the line. == Demise ==