Here is an image to sort of set the scene for the linked thread:
A high steel trestle done in HO scale!
- However if you look closely, you will see that it is made up of a number of off the shelf Atlas O/S scale Signal Bridges.
- Add stone piers below the vertical columns for an ever taller structure.
Food for thought?
An HO Signal Bridge would work just as well to represent a large steel trestle in N Scale.
If someone is getting into the new laser flat shape cutting systems these bridge components would be very easy to make in mass.