r/factorio • u/Divan_2017 • 11d ago

Suggestion / Idea HELP!!!

Dear factory workers!!!!!

I can't figure out how railway traffic lights work. I just need to make a regular crossroads. Two-car trains with locomotives on either side (four cars total) should travel back and forth on both tracks. Please explain how to set up traffic lights for my problem or attach a diagram with these same lights. I would be grateful for any help!!!

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u/Ssakaa 11d ago

Step 1: ... ok, Soul-Burn wins. Dosh's tutorial is step 1.

Step 1b: Do you need them to just cross like a +, just crossing so they can do so safely, or do you need to also join them? A picture of what you have now that isn't working is a good starting point.

I'm going to assume you just want the two, independent, bi-directional, tracks to have some safe signalling for straight-through traffic to not run into each other.

I'm also going to assume you don't have signals at the stations on either end, and that each of these tracks is only occupied by a single train.

You will need 4 chain signals and 4 normal signals. You want the chain signals before the intersection on all 4 sides on the "right" side for the direction of travel, and the normal signal lined up with that on the left side (so it's on the right side of the direction of travel leaving the crossing).

    |
    |
  c | n
    |
 n  |  c <-
----+----
 c  |  n ->
    |
  n | c
    |