The main structure is laser cut from plywood, with the corner overlays and the interior tunnel walls cut from card.
Hornby ~ 2 x Green Plastic Tunnel Mouth (Double Track) ~ OO Gauge REF5872
TUNNEL MOUTH Twin track kit stone built OO gauge1:76 Ancorton Models OOTM1
Javis OO Gauge Tunnel Single Double Track Flocked Grass Hill Scenery Rail Layout
OO Gauge Tunnel Stone Double Track Portal Model Railway Train Suit Hornby
2 Tunnel Portals double track - OO/HO Railway Scenery Busch 7027
