NMRA Track & Clearance Gauge - HO Scale

Check the accuracy of track components and wheelsets on locomotives and freight cars with this sheet metal standards gauge from the National Model Railroad Association (NMRA).  

The Mark V version of the NMRA standards gauge allows users to check track gauge; wing rail, guard rail, and frog spacing; turnout points; wheel gauge; clearance; and coupler height. Also included is a two-sided sheet with NMRA Recommended Practice RP-2, which describes and illustrates how to use the gauge.