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Smith Pond Junction Railroad Products tunnel-portal kit
I was able to use the picture as a guide and made my own pieces from scraps of cedar left from a fence project. The protals and wing walls turned out great and I’ve had a few orders from other club members too. It took me about 45 min to 1 hour for each one once I got a template made. A little stain and WA-LA 
I 've made a few for my HO layout with sucess and would recommend a tight grain wood for the small scale stuff. Keep the projects coming.