The Overseas Railroad was an extension of the Florida East Coast Railway
The top post card, above was mailed in 1914, soon after the viaduct opened. It was published by the H. S. Kress Company. A publisher and large distributor of postcards through their national chain of Five & Dime stores. They were purchased by Genesco in 1964 who slowly began shutting the business down.
The middle post card was published by the Leighton & Valentine Company
The last of the post cards was published by the E.C. Kropp Company: