Here’s information that Emmett’s youngest brother, Walker Wilson, was applying for membership in the Train Dispatcher’s Association of America (via Google docs).
Deciphering the item — S.A.L. was the Seaboard Air Lines railroad.
Walker’s employment with the railroad was not simply a family tradition, but an important employer in the early 1900s — in contemporary terms, it is compared to working at NASA.
According to various city directory records, Walker remained with the railroad for the rest of his life, working his way up the management ladder starting as a clerk. Like his brothers Emmett and Julian, he became expert at the telegraph starting in the Chipley depot, then he was assigned to different stations and posts as his career developed over the decades.