Pecialist suppliers of 5 inch gauge and 7 inch gauge miniature railway products for the enthusiast, including live steam locomotive parts, wagons, chassis parts, model engineering materials and components. Please select a department below, or visit our parts shop:. On Sunday, April 19, 2015. Latest News from 17D. 10 1/4 inch Gauge Parts Now Available. We have now added some 10¼ inch gauge machined parts. Posted on 24 Mar 2015 by Robin. 17D Miniatures is now on Facebook! Posted on 15 Mar 2015 by Robin.