Yep, definitely check vertical clearances. I included a tunnel in my layout and used Lionel tunnel portals. I assumed that Lionel cars would clear Lionel tunnel portals. Bad assumption. My daughter bought a Monsters Inc bobbing head box car and found out the hard way that it won't clear the tunnels. That was the main reason for adding the second overhead loop. Figure out the tallest car you'd likely ever purchase and plan ahead. Also go with the foam tunnel portals from Scenic Express. They're super easy to modify, look great and not too expensive.
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