The Amarillo Globe-News published a story about Sixth Avenue, which is historic Route 66 through town. It’s a good article: it gives some historical background, tells how the district evolved and how it’s doing now. To read the story requires registration, but it’s free. Here is contact information for the district, which, regrettably, doesn’t seem to have its own Web site.
I’ve been on Sixth Avenue, and it reminds me very much of the Cherry Street district in Tulsa. To me, that’s a good thing.