Here’s something you don’t often see modeled. The Reading’s Mahanoy Tunnel portal fans.
There is a model available in N Scale
https://thenarch.com/products/barnesville-tunnel-n-scale-kit
Very interesting prototype.
On a warm summer nite I can sometimes hear these bad boys run…
So when will we see this on your pike Bob?
I dont have a tunnel or I just might. Not that not having a place for a building has stopped me before…
Sounds like you need to build a tunnel so that you can recreate the portal