Ok, say you want to build a ghost train into the ground (or raise the ground to resemble a building) Start right outside of this building by laying the track, and direct it right into the building. Then start with your station platform. When you get a couple of "blocks" of your platform, go back and delete the tracks that you started with outside of the building (above ground.) Then right click where you left off and continue building. I have a really cool (if I do say so myself) ghost train ride, which I'll post on my website soon. I'll also do some example construction screenshots and post them soon.
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Neil
Pittsburgh, PA