About those turnouts

James had a fantastic question about the two turnouts and the reverse curve through them. While writing my reply to that comment I started realising it would be easier to reply if I could include a drawing to illustrate my words. Following is an excerpt of the track plan I posted earlier today:

Staging is to the left of this image.

The mainline is yellow. Offstage is a staging cassette that’s three cars long that serves both to feed trains in and out of the scene as well as being the other (missing) turnout to complete the runaround loop. I can be obstinate and an example of that is my insistence that everytime we build an S curve in track it should have, at its centre, a straight track at least the length of one car. And yet here I have no straight track and then placed two turnouts in there. The curve is a generous radius, the track is embedded in the pavement so there’s an inherited guardrail from that street track, and the short trains run at a walking pace. I’m going to try and get away with this.

Both turnouts are single point “trolley” turnouts. I’ll scratchbuild them and that’s going to be a lot of fun. As drawn both turnouts are tiny little #5’s. I’ll keep the turnout into Coy as a #5 but I think I might tighten the loop turnout to a #4. Only tiny 44 ton engines go through the loop and the viewer looks into the curve so the optical illusion hides the sharper curve and that sharper diverging radius shortens the fouling point on the loop.

Coy Paper’s actual siding is green in the drawing. Two cars at the very end. To work Coy we first empty out the outbound car or two before we worry about dropping the new cars.

The runaround loop (blue) is two cars long. Cars never enter the loop and are always left on the main. This loop is “engine only” territory.

I mentioned that heavy, modern, cars can be offspot. This happens in a one car length at the very end of the mainline (yellow underline against yellow highlighter).

I’m “getting there” in this design. As promised, today I drank a coffee, ate a doughnut, and printed off the plan.

This is some of my best design work in a long time. I’m genuinely excited about this.



Categories: Claremont & Concord, How I think, model railway design

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