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
Hornby R164 ~ 2 x Green Plastic Tunnel Mouth Double Track ~ OO Gauge
TUNNEL MOUTH Twin track kit stone built OO gauge1:76 Ancorton Models OOTM1
Ancorton N Gauge Tunnel Mouth Single Track Ntm2 95628
2 Tunnel Portals double track - OO/HO Railway Scenery Busch 7027
Modelscene 5046 OO Gauge Tunnel Portal Double Track
