I am just getting back into my O Scale lionel trains and have constructed a 5x12 layout. Well almost constructed. My delima here is I would like to build some wooden trestles for 2 elevated loops but again as I stated I am just getting back inot my trains from about a 15 year lay off. All I have ever had for layout were the flat as pancake 4x8 styles. One loop will b about 5 inches off the base and the other about 10 inches. I do have one mountain constructued by the first loop does not go through it. I am planning a second one for both loops as well as the two base loops. Yes I am craming alot into a tiny space but I like watching as many trains as I can get moving that I can. Could anyone provide me with typical o scale wood sizes to use for building these tresltes and a spacing requirment to follow for the trestles. Also what hardware to use to attached each member together or is glue good enough. Thanks
You may want to check out this site for some basic information and ideas.
You will want “timbers” that are 12-14 scale inches on a side for your bent posts, so something close to 1/2" would be close enough to pass muster. For your stringers under the ties, 5/16" thick X 1/2"-5/8" high X 10" long should be the right size. Sway braces would be 1/8" thick, 1/2" wide, and as long as needed to fit a standard pattern. Girts would be the same as the sway braces. This is my rather hasty guess. You might be much better off over in the Classic Toy Trains column next door. Those guys are the experts with O scale.