Albi1

Thank you Chrissaf, Other respondents seem to now understand what I want. I have an assortment of old track and during the construction of the layout I did briefly have the double loop up and running but only by cutting a piece of track to fill the final gap and not happy that all other joints were as they should be. At that I ran out of time and reverted to the basic Thomas track plus a short extension to the supplied siding so that it was ‘finished’ for Christmas. Even then I added the scratch built platform and a couple of backdrop houses after the big reveal.

Tony57. Sorry, I’ve re-read your original post and now see that it is a second radius inner loop. I would like it to be an oval roughly parallel to the outer loop. What, if possible would that add to what you have done with R-619? Also, could the diamond crossing be on the left or right curves to free up what little straight I have on the near side for the points siding?

Hi all. Yes that is what I am after but there doesn’t seem to be a track piece to make the final connection smoothly when making the inner oval a second radius. Tony57 your suggested track using R-619 looks as though it uses a first radius inner oval/circle but what track pieces made to connections to the diamond crossing? Chrissaf, I am using iPad and so far have not been able to download SCARM. Part of my reason for wanting this particular feature is down to to way my autistic grandson plays. He loves to be at eye level to the track, and loves repetition, hence the continuous double loop. Although he copes ok with points I am trying to avoid too many of them and limiting them to sidings.

Tony57. The layout as it stands. It is basically work in progress as it had to be made away from its location and built in secretly in the week before Christmas. Everything forward of the tunnel is subject to change.

Tony57. Thank you for your response. I haven’t as yet checked out what you are suggesting but from your description of an inverted figure of 8 it does seem that you have misunderstood my requirement. What I am after is a second radius oval INSIDE a third radius oval but swapping over via the diamond crossing so that the third radius continues after the crossing as second radius until it once again reaches the crossing on its other branch and becomes third radius again. Not two ovals joined side by side to form an 8. More like the @ sign that this keeps going to when I sketch my idea of the layout. The crossing can be anywhere but the back run but would most conveniently be on one of the curves as I want to put a station on the rather short length of straight on the near side. I should mention that the layout has working access through a hole in the centre as there is no way my grandson would reach anything near the back without climbing on the layout without it.

My autistic grandson had a Thomas set for Christmas that I have set up for him on a 6’ x 4’ layout that folds up against his bedroom wall (with 6.5” clearance for fixed buildings etc). The back or the layout runs in a tunnel created with a Metcalfe retaining wall and tunnel entrance kits. I would now like to create a continuous double circuit using a R615 Diamond Crossing and 2nd radius curves and straights if this is possible. The inner circuit will be forward of the retaining wall requiring a larger than standard spacing from the outer circuit along the back run. What extra track other than the standard oval plus short siding that came with the Thomas set, is needed to achieve a smooth run given that the outer radius becomes the inner radius and vice versa at the crossing. I already have some 2nd radius curves and the crossing. Also would it all run electrically with a single connection point from the one controller?