Just to help: LSM is incompatible with Airports DLC.

I recommend using EML's Prop and Tree Anarchy.

I confirm that ETST is a risky mod, like MOM, it can break your gamesave. This is why it is not included in my Airports DLC compatible modlist. We asked BloodyPenguin to check the behavior of these train tracks. I am pretty sure he is going to deal with it, soon.