Ready_to_roll, the best MR hobby shop arround : 831 NW 143 Street.
Micro Macro Mundo is specialized in Euro models (Brawa, Roco, Maerklin, Trix, etc..) : 7138 SW 117 Av.
I remember Orange Blossom Hobbies... one of the best memories of my childhood. Big orange art-deco building at 36th Street... my first train set (tyco) was bought there many Christmas days ago...