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Sunflower junction (8-way RHD unbuffered double roundabout; 11-car max)
Posted: Thu Oct 15, 2020 12:19 pm
by Theikkru
As far as I'm aware, no-one's posted an 8-way junction. The lack of one's been weighing on my mind for a while now, so I sat down and made one. I'm not entirely convinced there's a practical necessity for such a thing, but here it is anyways:
Sunflower.png (701.43 KiB) Viewed 2568 times
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Trains longer than 11 cars will crash into themselves if they try to make a U-turn, and I'm pretty sure this is one of those junctions that you can't swap to left-hand-drive without a significant rework, due to space constraints. Other than that, this seems to behave pretty well, based on my limited testing in sandbox. If nothing else, this can be pruned to serve as any X-way junction where X is less than 9.
Thoughts?
Re: Sunflower junction (8-way RHD unbuffered double roundabout; 10-car max)
Posted: Thu Oct 15, 2020 1:39 pm
by Gamatron332
Beautiful. I want one but I have taken a hiatus from blueprints. But “my own” design will be similar
. Have you found any throughout issues? (How many trains can it safely handle before a deadlock is imminent ) I can see this being used at the edge of a grid megabase where the grid stops and the trains become “screwy”
Re: Sunflower junction (8-way RHD unbuffered double roundabout; 10-car max)
Posted: Thu Oct 15, 2020 4:07 pm
by Theikkru
It's an unbuffered junction governed by chain signals, so it shouldn't ever deadlock, so long as the exit lanes remain unobstructed. I don't have a good way to measure throughput since there isn't a neat tool (like the 4-way throughput tester) that will work properly on this thing; there can technically be up to 8 trains in it simultaneously, but that's heavily dependent on what routes the trains are taking. I did try to minimize the impact of left turns.
Re: Sunflower junction (8-way RHD unbuffered double roundabout; 10-car max)
Posted: Thu Oct 15, 2020 7:06 pm
by ickputzdirwech
Theikkru wrote: ↑ Thu Oct 15, 2020 12:19 pm
Trains longer than 10 cars will crash into themselves if they try to make a U-turn
Is that because they actually take a left turn/the inner circle when they do a U-turn?
Re: Sunflower junction (8-way RHD unbuffered double roundabout; 10-car max)
Posted: Thu Oct 15, 2020 7:10 pm
by Theikkru
ickputzdirwech wrote: ↑ Thu Oct 15, 2020 7:06 pm
Is that because they actually take a left turn/the inner circle when they do a U-turn?
Yes.
I'm currently trying to redesign it so the trains entering the junction in a left turn don't block the exit to their immediate right...
OK I've fixed it so that the blocking no longer occurs. This had the side effects of moving the entrances/exits around and increasing the inner circle enough to accommodate an additional car.
. Have you found any throughout issues? (How many trains can it safely handle before a deadlock is imminent ) I can see this being used at the edge of a grid megabase where the grid stops and the trains become “screwy”