... roads. If you want longer roads then the line from the centre would have to be at an angle and that would mean that your fiddle yard would have to move at the same angle, and your loco head shunt section would also have to be at the same angle. Your main fiddle yard and your loco head shunt would them become forms of parallelograms. A problem with this setup is that you might require a bit more room to give full movement of the yard- i.e. the outermost fiddle yard track matches the innermost curve- since the movement of the fiddle yard to the left also moves it down and if the lower limit of the drawing is a brick wall, then there will be definite limit to the leftward travel. I worked out something similar many years ago but used a sector plate rather than a traverser on a curve. I wrote it up for the S Scale Newsletter so I'll have to dig back a long way to see if I can find it and refresh my memory on the maths that was necessary Jim. posted ...