Concrete tunnel portals

[Hayashi]

Does anyone make poured concrete tunnel portals? I see lots of stone, brick, and concrete block portals, but all the shinkansen photos I see appear to have poured concrete portals.

 

I know they probably aren't too difficult to create myself, but for what appear to be pretty low prices for pre-made portals, it would be faster and easier to buy them. Especially because then I don't have to futz with trying to create smooth and good looking single track and double track openings.

[cteno4]

I don’t think there are any commercial Shinkansen tunnel portals. There is a euro one that similar from noch.

 

https://www.1999.co.jp/eng/10279313

 

One of the forum members, Inobu, cast some and was thinking of selling them at one point but that never panned out. Sadly many of the images in some of these posts got clobbered in one of the forum software upgrades and content migrations/rebuilds.

Jeff