Knights Key (or Knight Key) was an important staging point for Flagler's railroad. He had docks built to facilitate bringing materials down the Keys by boat before there was rail access.
In the
History of Knights Key Dock the author Jerry Wilkinson says:
"..the construction of Knight's Key Dock was one of the largest supplementary parts of a larger project (to facilitate but be destroyed after the original is completed) ever. From 1906 it served as a transfer facility for material from deep draught ocean transports to shallow draught lighters (barges) for delivery to various construction sites. From 1908 to 1912 it served to transfer people and material to and from ocean liners and the Florida East Coast Railway (FEC) System. It was the southern terminus for the FEC railroad. After February 22, 1912 it could not be reached by trains and later was burned to the waterline."