The Sunset East route is geographically close but was not part of the original Amtrak network May 1, 1971.
That said - I must congratulate Mr. (or Mrs) LWBaxter for remarkable deduction backed by a solid knowledge of routes Amtrak has operated over the past 40 years. Well played!!!!!!!!
This station is indeed Valdosta, GA and with it being located adjacent to the SCL freight yard on the edge of town, we were able to reach it from I-75 without having to drive all the way into town. I've still never really 'seen' Valdosta as my only other visit there was riding through in the middle of the night aboard the 'Floridian' shortly before it was discontinued in 1979.
I did have one other hint for this station and it was so good I'd like to share it anyway - that hint was "For a time during the 1970's Amtrak was not the only agency operating regularly scheduled passenger trains past this building." That other agency, of course, was the original 'Auto-Train' which passed through Valdosta with it's short-lived Louisville service.
OK - LWBaxter, it's your turn to post a station photograph!