A much older sign... or at least an older looking sign at <a href="https://en.wikipedia.org/wiki/Kingstree_(Amtrak_station)" class="extiw" title="w:Kingstree (Amtrak station)">Kingstree (Amtrak station)</a> in <a href="https://en.wikipedia.org/wiki/Kingstree,_South_Carolina" class="extiw" title="w:Kingstree, South Carolina">Kingstree, South Carolina</a>, warning travelers to keep behind the yellow line until the train stops completely. Compared to the Amtrak signs, this looks like it dates back to the station's days as an Atlantic Coast Line Railroad depot.
<a href="//commons.wikimedia.org/wiki/User:DanTD" title="User:DanTD">DanTD</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>