Jagrick posted:That clearance is fine as the track placement was not altered (this is an original Lionel display). The felt will sag until the glue hardens so in these later tunnels the brown paper was there to hold felt up until hardened, and then it often flake/deteriorate out over the years. The earlier tunnels used metal screens that lasted, well forever!!
Yeah, makes sense as this one is original Lionel.
On my D-105 I learned some lessons about building mountains with curved track pieces heading into the portals. I still occasionally have issues today with some larger and newer locos where they just clip the sides. Most of the PW stuff just glides through with no problems.
