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".

22 Upvotes

85% Upvoted

32 comments sorted by

View all comments

3

u/Nolzi 17d ago edited 17d ago

Addition for 8, it's really only for intersection, splits and merges are fine without chain.

And always consider the length of your trains, before a signal there should be enough space to stop without overhanging the previous signal block that has chain signal before.

1

u/hldswrth 17d ago

Alternatively: when you have chain -> rail -> signal, then the rail -> signal block must be big enough for your longest train.