WOW! Your trestles are beautiful. I’d love to buy some! As to your height issue, I usually use 6” from railhead to the lowest point on the overhead track or trestle, whichever is lower. But you should be fine with your 5.75”. My concern is with your grade and sharp transition, especially if you’re running long wheelbase scale locos and you aren’t using transitions like 1% for the first two feet and so on. You’re likely to have a problem with steam engine pilots shorting against these sharp vertical curves as well.
otherwise, your track and backdrops look great. I wish I had made half your progress on my layout.
Rubin
