Most of the lumber we buy for train table's would be designated SPF, avoid the F - fir douglass and white fir doug fir is strong but brittle, white fir will twist and turn and is useless for layout building.
P - pine southern yellow pine is junk for our purposes it's mostly used for trusses and treated lumber. White pine is great it's what we use for stair stock and thats why its so expensive.
S - spruce is good stuff soft strong and stays true. Buy your lumber at a lumber yard that pros use.
Lumber is the same as its always been........... just need to know what to buy.
