Seaboard–All Florida Railway
The Seaboard–All Florida Railway was a subsidiary of the Seaboard Air Line Railroad that was created in June 1925. It oversaw two major extensions of the system to southern Florida on each coast in response to the Florida land boom of the 1920s. The company gave the construction contract for the extension to Foley Brothers of St. Paul, Minnesota, who was one of the largest railroad contractors in the country at the time. Both extensions were heavily championed by Seaboard Air Line president S. Davies Warfield, and were constructed by Foley Brothers railroad contractors. Both extensions also allowed the Seaboard to better compete with the Florida East Coast Railway and the Atlantic Coast Line Railroad, who already served the lower east and west coasts of Florida respectively.
East coast
On the east coast, the Seaboard–All Florida Railway oversaw the extension of the Seaboard Air Line's line at West Palm Beach south to Fort Lauderdale and Miami. Seaboard's line to West Palm Beach, which originated at their main line in Coleman, was built a year prior by another Seaboard Air Line subsidiary, the Florida Western and Northern Railroad. Upon completion of the extension, the Seaboard–All Florida Railway from West Palm Beach to Miami was designated as the Seaboard Air Line Railroad's Miami Subdivision.The east coast route is still in service today and is now the state-owned South Florida Rail Corridor.
West coast
On the west coast, the Seaboard–All Florida Railway oversaw construction of a line from Hull south to Fort Myers to the Estero River in Estero, with branches from Fort Myers to LaBelle and Punta Rassa. Another Seaboard Air Line subsidiary, the Naples, Seaboard and Gulf Railway, oversaw the construction of the line from the Estero River to Naples.Unlike the east coast route, the west coast route was not as successful and would exist for less than thirty years. It was gradually abandoned from 1942 to 1952.