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About Terrain Structures Tunnel Portals, Retaining Walls, Culverts, and Roads reinforce natural terrain contours and add functionality, realism and interest to your layout.
HO Scale Random Stone Single C1255 Cover your HO scale tunnels with a random stone portal and color with Earth Colors™ Liquid Pigment. Meets NMRA specifications.
Outside: 5 11/16" w x 5 1/8" h (14.4 cm x 13 cm)
Inside: 2 13/16" w x 3 3/4" h (7.14 cm x 9.52 cm)