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With adequately spaced double track 6” on center rail spacing. How do you find a double tunnel portal to accommodate? I have a Class A on O72 curves don’t see a way to use a single portal. Do you have to scratch build?
 

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I think 6” on center is more than what you need. NMRA RP-7.2 has track center at 4 7/16 for 72” radius and 5 13/16 for 32 21/32 radius for modern trains.

Scenic express makes double track portals. The one in the first shot here is on a straight, but it might fit you needs. If not, they are not hard to make. The second shot is a masonry bridge made using rigid foam. And the third shot is a portal made using wood.
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Wheel Vehicle Yellow Tire Building

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Here you go. I raised the height of the portal so the bottom was level with the top of the rail head.
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Well, as others have said, there's a lot of ways to go. On my layout, I used a pair of Athern double track portals (below is a photo from their site, which I printed out and glued to foamboard to assist in planning, and as installed on the layout, after painting/weathering):

Rectangle Symmetry Building material Font Arch


Infrastructure Motor vehicle Urban design Mode of transport Architecture


Since then, I made my own copies out of spare foam for a drop-on tunnel I built for my brother-in-law's Christmas layout:

Water Plant Wood Lake Grass


After that, I used the same basic design to produce custom-size portals for another layout. So, there's a lot of flexibility to purchase or create your own portals. All the basic techniques are available on YouTube (along with the sum total of human knowledge . . . and delusion! :rolleyes:). Good luck!
 
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