The Great Gatsby, old Union Station

I'd like to know if "old" in the following excerpt from the chapter 9 of The Great Gatsby is a term of affection (good old) or means aged, not young:

One of my most vivid memories is of coming back West from prep school and later from college at Christmas time. Those who went farther than Chicago would gather in the old dim Union Station at six o'clock of a December evening with a few Chicago friends already caught up into their own holiday gayeties to bid them a hasty goodbye.

Thank you.