N Scale Model Railway Tunnel Portal Clearance Tool
thingiverse
A simple tool to make sure your hole is the right size for an N Scale Train. This is for a single tunnel portal. Assumes a straight track at the portal. If on a curve widen the portal by about 5mm or so - the tighter the curve the wider it needs to be. (5 is for about 12" R in N scale). The portal is the hole in the middle, the outside diameter does not hurt but the NMRA standard should fit into the hole in the middle. Let you use it like a stencil to mark the hole. Bigger by a bit is better than too small.
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