... topic: 1084 GW tandem turnout posted: 22 Mar 2010 12:06 from: Phil O Hi All Does anyone have any info on how the GW would have arranged the timbers under a tandem turnout? I have had a look in David Smiths book GWR Switch& Crossing practice and can find no help there. Below is the turnout which I would like to sort out the timbers. 38_220704_280000000.png TIA Phil Last edited on 22 Mar 2010 12:08 by Phil O posted: 23 Mar 2010 21:26 from: Paul Boyd Tricky question! This is the way I do it, which may be right or wrong. I work on the basis that each element of the turnout is made up of standard components, i.e., three crossings and two switches. On the prototype, the timber spacing within each component was pretty much fixed so that the special chairs would fit so that's what you have to base the overall timbering on. So, starting with the switches, you know what type of switch you're using and where the rail joint ...