N Scale Model Railroad Double Track Tunnel Gauges
thingiverse
Rebuilding my layout and fiddling with the tiny metal NMRA gauge to check tunnel clearances isn't fun. Designed two Double Track tunnel clearance gauges, one for straight the other for curves, seems NMRA wants a little wider tunnel entry if the track is curved at the point of the entry The standard is 15mm from track centre to wall of tunnel - then add the distance between tracks. For straight track I went with 27mm track spacing (about 1.25") assuming a modern mainline. The curved one gives an extra 5mm at 32mm track spacing. Height was based on my NMRA gauge, plus a little wiggle room. Will depend on your track code and your roadbed, if need be glue a foam bottom on the gauge to add a mm or two. This is my first design, just learning so be kind. Done in Tinkercad.
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