7-1/4 and 7-1/2 Dual Gauge

Mike Venezia wrote on Chaski.org:


 * My track in Jackson, NJ, The Iron Acres Railroad, was a dual gauge railroad. Many visitors came with both gauges (7-1/4 and 7-1/2 inch gauge). It took a bit of experimenting to get it to work but it did. My gauge in the curves was set to a strict 7.562 inch and the straights were about 7.530.  We would machine a larger (1/2" wide I think) slot in the switch frog and widen the gap at the points.  We then set the Back to Back at exactly 6.875 keeping a very minimal space between the guard rail and the stock rail.  I would put about a 2.5 to 3" lead on each end of the guard rail to bring the train over smoothly and keep them from wandering.  I had a few problems with a couple visiting engines that had wheels that were less than 0.750 inch wide but for the most part once I got it figured out we had lots of fun.


 * Dual gauge railroads require a lot of close tolerances and a bit more maintenance the a railroad set up to run one gauge. If I do build a railroad at my place in PA it will be 7.5" only to cut down on having to be so finicky.

Nick Edwards wrote a detailed description of his * Wimberley Blanco & Southern Railroad Dual Gauge Track.