What is O-Scale, 1:48, 1/4" Scale, O-Gauge, 2-Rail, Proto 48, P48, HiRail, 3-Rail
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A Word on Gauge and Scale by MTH
What is HiRailing anyway? (high rail, hi-rail)
The History of Proto48 by Proto48 Modeler
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This page is current as of 10.28.2013.