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Coalfrog, ER's second post keeps r1 radius to a minimum but you can only have one train continuously running (unless you don't mind collisions). But the first post shows a loop within a loop.  But the two switches back to back, called a cross-over (as opposed to a crossing), to get from one oval to the other present a tight S curve which could give problems.  This can be eliminated by having the switch on the outer loop being a <A onmouseover="window.status='left handed'; return true;" style="BORDER-BOTTOM: 3px double; TEXT-DECORATION: none" onmouseout="window.status=''; return true;" href="http://www.serverlogic3.com/lm/rtl3.asp?si=31&k=left%20handed">left handed</A> one and the one on the inner loop being a right handed one, the curved part being part of the oval's curved track. And at the top of the diagram, you could exit the inner loop using a <A onmouseover="window.status='left hand'; return true;" style="BORDER-BOTTOM: 3px double; TEXT-DECORATION: none" onmouseout="window.status=''; return true;" href="http://www.serverlogic3.com/lm/rtl3.asp?si=31&k=left%20hand">left hand</A> switch and the straight route of the switch would enter the curved route of a right hand switch on the outer loop.  Thus you would end up with 6 sections of curved track on the left end of the inner loop; and the right end of the inner loop would have a left hand switch at the top, then 4 sections of curved track, ending with a the right hand switch at the bottom. You will need to extend the straight route between each pair of switches with either a 10040 (41mm long) or 10050 (52 mm) small section of straight track to keep the spacing between tracks more or less correct.  I prefer using the 10050 sections. The precise length is 46 mm  so if you need two, one of each works nicely, too! Art
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