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3 and 4 way intersections

https://forums.factorio.com/viewtopic.php?t=100614

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Re: 3 and 4 way intersections

Posted: Sat Jan 18, 2025 11:48 am
by SavageVector
SavageVector wrote: Wed Jan 15, 2025 10:34 am Hi! I have literally no idea what I'm doing, but I made a 4-lane 4-way RHT intersection. I run 2-8 trains which locks up a lot of elevated 4-lanes I've seen, and my city block size is only 256, which removes most of the rest. I really wanted an intersection with no crossings, so just did my best. Looks pretty messy, and I have no idea how to do rail signals on an intersection without crossings; but I think it works okay?

I call this one the Vector V2 (you don't want to see the first) because I'm uncreative and vain. I don't like that it's taller than wide, and it could use a little cleaning up on some curves; but since this is my first ever 4-lane 4-way in general, I'm just gonna call it good enough.
Edit: I just noticed that my 2-way symmetrical intersection has 225 rail signals. Okay, it is no longer good enough...

2-4-0: 197.37 TPM
2-8-0: 128.96 TPM

01-15-2025, 05-19-49.png

Made the Vector version 3. Squared it up by getting the height 12 tiles shorter, while also giving the overall intersection an ever so slightly thinner footprint. Added some (atrociously spaced) roboports and electric poles. Put slightly more care into signals, cutting back by like 10% with negligible impact on TPM, although I still have no real idea what I'm doing.
01-18-2025, 06-33-47.png
01-18-2025, 06-33-47.png (933.62 KiB) Viewed 754 times

Re: 3 and 4 way intersections

Posted: Wed Jan 22, 2025 3:37 pm
by solublefish
After much fiddling, I fit my Celtic Turbine hybrid into 128x128 (4 chunks square). It tests around 200 TPM with 2-4 trains.
01-22-2025, 05-37-08.png
01-22-2025, 05-37-08.png (1.68 MiB) Viewed 617 times

Notes:
- It's still really two overlapping 2-lane interchanges. This makes it easy to upgrade from a 2-lane to a 4-lane system. But there's no lane changing inside - I do that on straights anyway.
- The inner part is still basically Bocian's Celtic Knot. The narrow profile makes it a good fit without sacrificing TPM.
- Here's a quick 3-leg variant.
01-22-2025, 05-40-58.png
01-22-2025, 05-40-58.png (938.35 KiB) Viewed 617 times


- The 2-lane turbine may be useful in its own right. Again it's upgradable to 4 lanes just by inserting a Celtic Knot. But also its TPM is decent for the footprint (~105 / 128x128), and the center is big enough to put a load of useful stuff in.
01-22-2025, 07-33-41.png
01-22-2025, 07-33-41.png (6.91 MiB) Viewed 617 times

Re: 3 and 4 way intersections

Posted: Fri Jan 24, 2025 1:40 am
by Maeximus
I made a elevated version of HansJoachim's 4 way intersection "simple": https://factoriobin.com/post/buqn83
I have no idea how these things work but they look exactly the same signal block wise so I would assume the numbers are the same (even though I have not tested it)
grafik.png
grafik.png (923.78 KiB) Viewed 544 times

Re: 3 and 4 way intersections

Posted: Sun Jan 26, 2025 8:56 am
by enthusiast
A simple intersection that does not use elevated rails and is surprisingly effective.

The 2-4 train version scored 80.83.


The 1-4 train version scored 68.17:

simplebuffered.png
simplebuffered.png (346.13 KiB) Viewed 413 times

Re: 3 and 4 way intersections

Posted: Sun Jan 26, 2025 9:12 pm
by Factoriointersection
Great! Updated the forum post=)

Re: 3 and 4 way intersections

Posted: Sun Feb 02, 2025 6:16 am
by TheNerdHerder
I started playing Factorio about a month ago, and for my second playthrough (now with DLC) I wanted to focus on trains. So I started building my own train book. When I got to doing the intersections I realized how complicated these things can get, but I didn't want to just use a BP I found on some random forum... Anyways, I wanted something with a higher TPM and a relatively small footprint. I came up with this "over-under" design that worked good but was still rather large. I then found that if I offset the lanes I could reduce the footprint by a sizable amount. And so, rather creatively, I named it the "Offset Over-Under". It averages ~108 TPM with a size of 110x110. No idea if this design already exists but I made it myself and thought I'd share it.

It could definitely be better, the signal placement is atrocious but it is good enough for me right now. I have another w.i.p. version of this that is 102x102 but the TPM suffers and I am pretty sure it is entirely because of the signals. If anyone can point me in the direction to a guide for better signal placement it would be much appreciated.

offsetoverunder.png
offsetoverunder.png (840.28 KiB) Viewed 167 times


LHT version:
offsetoverunderlht.png
offsetoverunderlht.png (77.26 KiB) Viewed 167 times
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