... the timbers are arranged around the point work, If someone could run there eye across it and check it is all "do-able" that would be fantastic or any pointers for improvements etc Thanks again Josh Attachment: attach_673_964_New_Idea.box 357 posted: 27 Oct 2009 15:39 from: Martin Wynne Hi Josh, I'm afraid you have made a common mistake with tandem turnouts. The two switches are not far enough apart. As a result there is insufficient space for the second switch blade to open behind the first switch rail: 2_270959_040000000.png On the prototype the blade opens by 4.1/4" which scales to 1.42mm in 4mm/ft scale. Even in P4 it's advisable to increase that to 4.1/2" (1.5mm) to ensure adequate flange clearance all along behind the open blade on flexible switches. In 00-SF or EM you will probably need even wider switch opening. So the absolute minimum offset (gauge-face to gauge-face) is 4.1/2" opening+ 2.3/4" rail-width= 7.1/4 ...