You need to give your librarian some pointers in alphabetizing. "The Last Steam Railroads in America" clearly comes before "Louisville and Nashville in the Appalachians"...
...as does "All Aboard" before "America's Colorful Railroads." Just nitpicking all in good humor:mrgreen:.
The most valuable rail related book I ever had was given to me by an uncle. If you do have it, it would be one of those two to the right of the DVD's (can't quite tell). I don't have it anymore but I believe it was called "Diesel Spotters Guide of North America."