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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 3452 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 3321 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 3321 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 3321 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 3248 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 3117 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 2871 times


LHT version:
offsetoverunderlht.png
offsetoverunderlht.png (77.26 KiB) Viewed 2871 times

Re: 3 and 4 way intersections

Posted: Fri Feb 07, 2025 9:49 pm
by gulyman
3 way, 2 rail T intersection designed for 1-2 trains. Foot print is 70x30. Scores 81 using intersection benchmark mod. Using 2-4 trains gives a score of 63.4. No worries if this doesn't meet whatever performance threshold there is.

Image

Image

Re: 3 and 4 way intersections

Posted: Sat Feb 08, 2025 6:48 am
by mmmPI
TheNerdHerder wrote: Sun Feb 02, 2025 6:16 am 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...
You're absolutely right, one should only use the safe blueprints from the official forum or make its own ! Picking random forum usually doesn't even lead to usable blueprint.
TheNerdHerder wrote: Sun Feb 02, 2025 6:16 am 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.
i think there are 3 schools here :

1) place as many as possible, it's in lab environment, every single tile ! ( or every wagon / every 2 wagons)

2) make it so you leave enough room for a choosen number of trains in between the merge ( 1 full train can park, 2 full trains can park ) using the size of train from the test could lead to alter a little the rail layout sometimes.

3) a mix of both , and you run the test several time to see if some version yield better result :D

Re: 3 and 4 way intersections

Posted: Wed Feb 12, 2025 10:45 am
by zefski
I loaded in the mod Intersection Testbench and I would like to test the intersection blueprint shown. The "T" button in the toolbar shows...

Unknown key: "shortcut.testbenchcontrols-name"

How do I get this mod working? Any help much appreciated. Screenshots attached.

Re: 3 and 4 way intersections

Posted: Thu Feb 13, 2025 5:01 am
by solublefish
zefski wrote: Wed Feb 12, 2025 10:45 am Unknown key: "shortcut.testbenchcontrols-name"

How do I get this mod working? Any help much appreciated. Screenshots attached.
I'm not that experienced but I suspect the problem is that you need to start the game from the special Testbenchcontrols Mod Scenario. You can't use the tool in a "normal" game.
02-12-2025, 21-01-11.png
02-12-2025, 21-01-11.png (240.55 KiB) Viewed 2409 times

Re: 3 and 4 way intersections

Posted: Thu Feb 13, 2025 2:16 pm
by zefski
Fantastic! I didn't see in the instructions that you had to start a new game with the mod scenario so many thanks for pointing that out - I'm up and running and testing my intersections now !!! Cheers.... :)

Re: 3 and 4 way intersections

Posted: Thu Feb 20, 2025 7:39 pm
by datarza
Here is the fixed 3 way intersection for placing `Big electric pole` in the center and better rail signals placement, like `3 vie design 4`
02-20-2025, 14-38-37.png
02-20-2025, 14-38-37.png (1.47 MiB) Viewed 2164 times

Re: 3 and 4 way intersections

Posted: Thu Feb 20, 2025 7:46 pm
by datarza
Updated Roundabout and Roundabout+Straights
02-20-2025, 14-43-17.png
02-20-2025, 14-43-17.png (1.05 MiB) Viewed 2160 times

Re: 3 and 4 way intersections

Posted: Mon Mar 17, 2025 10:35 pm
by Konijnde
Yes, you've heard of one "simple" intersection, but what about TWO "simple" intersections stacked on top of each other?
03-17-2025, 23-34-37.png
03-17-2025, 23-34-37.png (1.5 MiB) Viewed 1540 times

Re: 3 and 4 way intersections

Posted: Wed Mar 19, 2025 10:54 am
by syvkal
Compact T-Junction
3-Way 2-Lane Elevated

Screenshot 2025-03-19 194750.png
Screenshot 2025-03-19 194750.png (722.05 KiB) Viewed 1354 times

Added some more rail signals and ran some more tests
Screenshot 2025-03-19 201910.png
Screenshot 2025-03-19 201910.png (1.08 MiB) Viewed 1339 times

Re: 3 and 4 way intersections

Posted: Wed Mar 19, 2025 6:49 pm
by SpectrumQT
RHT version of yaongi's yaongi mk i design
Image



RHT version of hldswrth's Celtic Knot design
Image


A bit optimized versions of Vinyl_Scratch's Compact Half Trumpet L and R designs (score ~10% higher and have a bit different layout)
Image


Image

Re: 3 and 4 way intersections

Posted: Sat Mar 22, 2025 2:39 am
by Tonex
I was inspired by solublefish's Celtic Turbine v2 and redesigned it to be more compact (126 x 126 to 108 x 108) and to have slightly higher throughput (~207 TPM).

The Rose:

Image



The 4-lane interesection is made up of two nested 2-lane intersections, the Shuriken:

Image



and the Wreath:

Image

Re: 3 and 4 way intersections

Posted: Sun Mar 23, 2025 5:34 am
by Archimage
LHT 4 lane 3 way trumpet
116x97
2-4 trains
157 TPM

Image



2 lane turn off version

Image

Re: 3 and 4 way intersections

Posted: Mon Mar 31, 2025 12:57 pm
by Knotan
Robert3D wrote: Sun Nov 17, 2024 2:04 am Ive been trying to design some intersections for my SA playthrough. They use a 2-4-2 spacing because i like the symmetry and look. Ive been trying to balance compactness and throughput so while these arnt the fastest, they are much smaller then other designs. Both are LHT


Compact 3 Way

128 TPM
Size 84 x 58

3way.png


Compact 4 Way

106 TPM
Size 104 x 92

4way.png


The 4 Way technically allows for U-turns, but these should remain the exception. Too many trains trying to U-turn and turn right at the same time will dead lock it.

Both of these can probably still be improved but im satisfied with the results.
If you got any advice on how to make them better, let me know.
I had to register just to write that you are the god of trains bro !!! It's so awesome !

Re: 3 and 4 way intersections

Posted: Sat Apr 12, 2025 9:52 pm
by Robert3D
Knotan wrote: Mon Mar 31, 2025 12:57 pm
Robert3D wrote: Sun Nov 17, 2024 2:04 am Ive been trying to design some intersections for my SA playthrough. They use a 2-4-2 spacing because i like the symmetry and look. Ive been trying to balance compactness and throughput so while these arnt the fastest, they are much smaller then other designs. Both are LHT


Compact 3 Way

128 TPM
Size 84 x 58

3way.png


Compact 4 Way

106 TPM
Size 104 x 92

4way.png


The 4 Way technically allows for U-turns, but these should remain the exception. Too many trains trying to U-turn and turn right at the same time will dead lock it.

Both of these can probably still be improved but im satisfied with the results.
If you got any advice on how to make them better, let me know.
I had to register just to write that you are the god of trains bro !!! It's so awesome !
Well thank you :D I hope you've been using the v2 version of the 4way, it prevents deadlocks and its so much better
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