For a tunnel that requires a double tunnel portal, the Concrete Double fits perfectly over two N scale tracks. Color with Earth Colors™ Liquid Pigment. Set contains 2 pieces.

Outside: 3 7/8 in w x 2 1/2 in h (9.84 cm x 6.35 cm) each
Inside: 2 7/16 in w x 2 1/16 in h (6.19 cm x 5.23 cm) each

Please Note: The product comes un-assembled and unpainted. This will require glue/paint and tools for complete assembly. (Modelling equipment sold separately)