[JerryB]

RE: Tunnel & Portal Clearance

Matt:

I have a clearance gauge based on RGS practice that I bought from Jonathan Bliese at Electric Model Works. It's 7 1/8" (12' in scale) wide x 10 3/32" (17' in scale) from the railhead to the top. These dimensions are designed to be used on tangent track. It does have various slopes at the top and at platform height, but I consider this the absolute minimum for my RR even though I wont be using large motive power.

I also worked out a formula for added clearance for curved track based on the NMRA recommended clearances for the smaller scales, but can't locate it right now. If you are thinking big motive power, you will need all of the clearance you can get!

Happy RRing,

Jerry