Greetings from California! New member of this forum.
I’ve been Modelling in OO UK and ON30 for a while now, and have recently started an OO9 micro layout. It’ll be on a 2’ by 3’ board, with a track elevation of at least 6”. I’ve been doing some grade and clearance tests to confirm the viability of my plan. I’ve run a MinitrainS Gmeinder and a Bachmann Rheneas, and both easily handle a 5% grade on a 9” radius curve pulling 7 minitrains shorty rolling stock. Coaches and vans will be heavier, but that’s the restrictions real railways had to deal with!
I now come to my question for you good folks. Is there an accepted OO9 clearance standard for tunnels and bridges? In the US, height is 2 3/8” and width is 1 3/4” . Trying it on my test track, it looked much larger than necessary. Particularly, if I can make the height less, I can reduce the grade to 4%. I note that Bachmann sells an OO9 tunnel portal. If anyone has one, what might it’s dimensions be?
So guys, thanks in advance for any advice you can share.