I've got a brown train station (and town hall!). I like all of them tbh, although the brown interior goes nicely with the zen train station that I have.
Mine is red. Green is actually my favorite color, but I don't really like the green one... Brown would've been nice. Maybe in my next town, if I ever find the motivation to start.
I got green, but I never really cared much about the color of my train station considering it's something we barely notice. My character and town map is something I worry over though
I started off with the green train station. Changed it to the fairy-tale station as soon as I could remodel it, though as I didn't like it at all in comparison. ^^;