How to use an NMRA gauge By Jenny Freeland | September 20, 2011 | Last updated on November 7, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Having trouble viewing this video? Please visit our Video FAQ page Model Railroader senior editor Jim Hediger shows how to use a National Model Railroad Association gauge to check the spacing of different aspects of track and your model trains.