MrTrain is offering this for your model train railroad layout: This set of 2 O Gauge Double tunnel portals, which are hand crafted in our Western Pennsylvania workshop measures 13” L by 9 3/4” H. Made from polystyrene with a wooden cap.

On Apr-21-09 at 14:13:44 PDT, seller added the following information:

Inside opening of this portal is 9 inch wide and 6 1/2 inches high.