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Good question. I don't know. However, I did just take a piece of ground and flatten it and put out several roundhouses with turntables and try several different textures and don't see any changes. (Note, this is some SG and some NG.) I also left one on the default green texture. Te tracks all still float above the ground, above the roundhouse floors and above the ground plate around the turn table.
OK. I have tried older, lower res, obviously flat textures (some of them being the recommended match with some of the older content) and nothing changes. I did make myself a small engine house and found that moving the attachment point to a Z of -0.1 made the rails look right. Possible problem with rendering in Trainz22?
OK, I turned texture detail down to Normal and that didn't change anything either. All the track still floats.
It's the track used on the roundhouse asset. Some track just plain floats above the surface due to how it's constructed. You need something with better/deeper sleepers to dig into the ground.
There's an easy way to replace it by using the Bulk replace assets to update the track with something that my work better. I replaced some track that way on one of my routes with RRTK bridge track which looks fine and doesn't float above the surface.
The other way is to clone the roundhouse and update the track in the configuration file (config.txt). This will then be your roundhouse that can't be uploaded to the DLS without permission from the original author.
The problem though is that some roundhouse assets cannot be fixed no matter what due to where the original track was positioned in the first place.