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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: Fri Dec 06, 2024 11:30 am
by coppercoil
BraveCaperCat wrote: Fri Dec 06, 2024 10:41 am I'd call it the S-Junction because the elevated rails almost make an S shape.
＄-junction 8-)

Re: 3 and 4 way intersections

Posted: Fri Dec 06, 2024 11:54 am
by yaongi
coppercoil wrote: Fri Dec 06, 2024 11:30 am
BraveCaperCat wrote: Fri Dec 06, 2024 10:41 am I'd call it the S-Junction because the elevated rails almost make an S shape.
＄-junction 8-)
Both of those are better than the non existent name I came up with :) I briefly tried to think of a name, and quickly gave up, hence the mk i. S Junction for the linguists, $ Junction for the capitalists.

Re: 3 and 4 way intersections

Posted: Fri Dec 06, 2024 9:46 pm
by hansjoachim
Awesome! I updated the thread, added the T section and T cross and yaongi mk 1 and also the turbo ones. Reply to me if something is missing <3

Re: 3 and 4 way intersections

Posted: Sat Dec 07, 2024 9:29 am
by hansjoachim
What do all of you think about quality fuel when testing intersections?

Re: 3 and 4 way intersections

Posted: Sat Dec 07, 2024 10:41 am
by BraveCaperCat
coppercoil wrote: Fri Dec 06, 2024 11:30 am
BraveCaperCat wrote: Fri Dec 06, 2024 10:41 am I'd call it the S-Junction because the elevated rails almost make an S shape.
＄-junction 8-)
Wow, it does look like a $ Junction.

Re: 3 and 4 way intersections

Posted: Sun Dec 08, 2024 12:04 pm
by Hovedgade
hansjoachim wrote: Fri Dec 06, 2024 9:46 pm Reply to me if something is missing <3
viewtopic.php?p=625779#p625779

Re: 3 and 4 way intersections

Posted: Sun Dec 08, 2024 12:07 pm
by hansjoachim
Hovedgade wrote: Sun Dec 08, 2024 12:04 pm
hansjoachim wrote: Fri Dec 06, 2024 9:46 pm Reply to me if something is missing <3
viewtopic.php?p=625779#p625779
I didn't add that one since its 2 to 4 lane. It needs its separate catagory.

Re: 3 and 4 way intersections

Posted: Wed Dec 18, 2024 11:29 am
by Vinyl_Scratch
When I was working on a grid aligned rail system I came up with the following design for a T intersection that both seems more compact than anything (other than the bottle) posted so far and seems to be a unique design as far as I can tell (you can trim it down a bit if you didn't want to fit it to a 32x32 grid)

I'm currently referring to this design as a compact half trumpet seeing as it looks like two halves of a trumpet intersection superimposed on top of each other but I'm open to better names if anyone has them.

Image

Compact Half Trumpet L variant


Compact Half Trumpet R variant

Re: 3 and 4 way intersections

Posted: Sun Dec 22, 2024 2:36 pm
by hldswrth
What I consider a cleaner Celtic Knot elevated 4-way 2 rail LHT intersection, scored around 95-100 when tested: https://factoriobin.com/post/l0ug0s
12-22-2024, 14-36-29.png
12-22-2024, 14-36-29.png (467.06 KiB) Viewed 1303 times

Re: 3 and 4 way intersections

Posted: Sun Dec 22, 2024 4:54 pm
by notnilc
notnilc wrote: Tue Dec 03, 2024 1:44 pm Made a rail book that fits between city blocks.
The trains per minute on the 3-way intersection is only 70-80 though.

Made improvements to the grid aligned city block rail book. Added a 4-way intersection, made it rotationally symmetric, and made it align with (0,0) instead of (1,-1). TPM on the 4 way and the 3 way is still around 70-80. Slight downside with this version is that the rail sections use 1 more tile of space. You could probably make some improvements around the signaling for the 3-way and for the corners but I'm pretty sure it won't matter since the trains will be bottlenecked by the 4 way intersections.


screenshot-tick-205740633.png
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Re: 3 and 4 way intersections

Posted: Fri Jan 03, 2025 9:31 pm
by hansjoachim
notnilc wrote: Sun Dec 22, 2024 4:54 pm
notnilc wrote: Tue Dec 03, 2024 1:44 pm Made a rail book that fits between city blocks.
The trains per minute on the 3-way intersection is only 70-80 though.

Made improvements to the grid aligned city block rail book. Added a 4-way intersection, made it rotationally symmetric, and made it align with (0,0) instead of (1,-1). TPM on the 4 way and the 3 way is still around 70-80. Slight downside with this version is that the rail sections use 1 more tile of space. You could probably make some improvements around the signaling for the 3-way and for the corners but I'm pretty sure it won't matter since the trains will be bottlenecked by the 4 way intersections.



screenshot-tick-205740633.png
Hey, so I looked at the 4 way. atm the ramps doesnt really help its throughput as it barly beats the Christmas interesction, which scores 73 in set 1. The double roundabouts are very costly to its throughput.
01-03-2025, 22-30-17.png
01-03-2025, 22-30-17.png (1.88 MiB) Viewed 1020 times

Re: 3 and 4 way intersections

Posted: Fri Jan 03, 2025 9:31 pm
by hansjoachim
hldswrth wrote: Sun Dec 22, 2024 2:36 pm What I consider a cleaner Celtic Knot elevated 4-way 2 rail LHT intersection, scored around 95-100 when tested: https://factoriobin.com/post/l0ug0s

12-22-2024, 14-36-29.png
Nice, added it!

Re: 3 and 4 way intersections

Posted: Fri Jan 03, 2025 9:31 pm
by hansjoachim
Vinyl_Scratch wrote: Wed Dec 18, 2024 11:29 am When I was working on a grid aligned rail system I came up with the following design for a T intersection that both seems more compact than anything (other than the bottle) posted so far and seems to be a unique design as far as I can tell (you can trim it down a bit if you didn't want to fit it to a 32x32 grid)

I'm currently referring to this design as a compact half trumpet seeing as it looks like two halves of a trumpet intersection superimposed on top of each other but I'm open to better names if anyone has them.

Image

Compact Half Trumpet L variant


Compact Half Trumpet R variant
They look good, added them=)

Re: 3 and 4 way intersections

Posted: Fri Jan 10, 2025 10:05 pm
by Emjas
Hello,

I modified the "Compact 4 Way v.2" (4-way, 4-lane, elevated) to do the following:
* RHT
* Removed rails that crossed

To accomplish this, it's slightly larger, but seems to have slightly better throughput than the original:

TPM: 145
Train 2-4-0

Image

Re: 3 and 4 way intersections

Posted: Wed Jan 15, 2025 10:34 am
by SavageVector
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
01-15-2025, 05-19-49.png (1009.93 KiB) Viewed 555 times

Re: 3 and 4 way intersections

Posted: Wed Jan 15, 2025 2:36 pm
by solublefish
Hi! Love the test bench; love the designs here. Thanks to everyone for participating. I wanted to share my first useful 2.0 interchange - I see I'm not the only one to have joined recently for this.

It's a 4-lane 4-way grade-separated RHT interchange in 154x154. I can't claim any expertise. I've literally pasted Bocian's excellent Celtic Knot as the inner part - it's better than anything I've got. Then I wrapped another 2-lane interchange around it - a Turbine, if I understand the prevailing terminology. My tests give ~180 TPM total with 2-4 trains on nuclear (standard quality) fuel. (I wouldn't mind confirmation since I'm new at this. For the same reason, I imagine improvements can be made and would welcome design pointers.)

Note SavageVector's impressive "Vector V2" tests better at every train length, with bounding box a little larger and arguably a friendlier footprint. If they'd posted it a week ago, I'd probably be using that, but here we are anyway.
01-16-2025, 00-55-29.png
01-16-2025, 00-55-29.png (824.03 KiB) Viewed 444 times

Re: 3 and 4 way intersections

Posted: Wed Jan 15, 2025 2:38 pm
by solublefish
hansjoachim wrote: Sat Dec 07, 2024 9:29 am What do all of you think about quality fuel when testing intersections?
I'm glad you added the fuel quality. Sure, it's not a huge feature compared to the overall excellent work on display here, but it makes the tool feel more "complete". Without the feature it would have been ages before I bothered testing higher quality fuel, and I'm shocked to see how much difference it makes in some cases.

Re: 3 and 4 way intersections

Posted: Wed Jan 15, 2025 7:40 pm
by Hovedgade
I'm loving the intersections that I see here although the spacing between signals does seem inconsistent at times.
Today I have three intersection designs to share but I have been unable to log into the factorio forums from my desktop pc so there wont be any pictures this time.

Spaghetti Knot
RHT, 2-4-2 tile spacing, 160x160, space age required


Simple 4 way (elevated)
RHT, 4 tile spacing, 36x36 (does fit into chunk aligned blueprints), space age required


Simple 3 way (elevated)
RHT, 4 tile spacing, 36x24 (does fit into chunk aligned blueprints), space age required


Please let me know if any of the blueprint strings are dysfunctional!

Re: 3 and 4 way intersections

Posted: Thu Jan 16, 2025 8:52 am
by solublefish
Images for Hovedgade's recent post, since I can log in. I'll delete this if Hovedgade is able to update theirs later.
Spaghetti Knot
RHT, 2-4-2 tile spacing, 160x160, space age required
01-16-2025, 00-50-27.png
01-16-2025, 00-50-27.png (878.5 KiB) Viewed 445 times
Simple 4 way (elevated)
RHT, 4 tile spacing, 36x36 (does fit into chunk aligned blueprints), space age required
01-16-2025, 00-50-50.png
01-16-2025, 00-50-50.png (910.56 KiB) Viewed 445 times
Simple 3 way (elevated)
RHT, 4 tile spacing, 36x24 (does fit into chunk aligned blueprints), space age required
01-16-2025, 00-51-06.png
01-16-2025, 00-51-06.png (597.95 KiB) Viewed 445 times

Re: 3 and 4 way intersections

Posted: Thu Jan 16, 2025 9:03 am
by solublefish
Hovedgade wrote: Wed Jan 15, 2025 7:40 pm the spacing between signals does seem inconsistent at times.
For sure mine are! I would love some pointers about signal spacing. My only strategy is to first make it safe with the basic chain-in and rail-out rule, then try improving things by adding and removing signals semi-randomly until I get bored.
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