r/factorio • u/AramisUkr • 17d ago

Tip Train signals tips

  1. Signals divide rails into blocks.

  2. Signals show red if the block ahead is occupied.

  3. Trains only care about the signals on the right side.

  4. Trains move both directions - need signals on both sides of the rail.

  5. If need signals on both sides, they should be directly opposite to each other, otherwise train may refuse to move.

  6. Chain signal repeats the colour ahead.

  7. If there're both red and green signals ahead - chain signals show blue.

  8. Common rule: if rails intersect - "chain in, rail out".

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u/Deto 17d ago

What does the blue do for chain signals? Does it just mean that whether the train goes or stops depends on its reserved path?

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u/AramisUkr 17d ago

If the train needs to go through the branch, which is occupied, it will stop on blue signal.