I use RealTrax on a carpet central and it is amazing how you can mix and match track pieces to make things fit, maybe not perfectly but pretty darn close. I just replaced an 042 switch with a 072 wye and of course had to readjust my inner loop. I do all this on the fly with various pieces and after about an hour I managed to 'close' the loop again with very little fudging. This part of the inner loop has mostly 054, one o42 curve and few short pieces and a straight. What is interesting is that a 4.25 short piece may not work at one end of the curve but works fine in the center or at another position!
I also discovered a bad joint and one non conductive straight piece. Discovered it was one of the really early RealTrax pieces with non copper electrical connections. Don't even know how it got in there, but it is now relegated to the end of a siding at best.
So if you don't have about 10 extra pieces of short track, go and buy some so you can mix and match to make appropriate length sections to fit those strange geometries that can develop. I like to use 1/2 curve pieces too if necessary.
