Each signal creates a "block", this is a section of track. The most important thing that needs to be understood is how signals operate in the first place. Okay, I'm going to do my best to explain it even though you've already said you don't care anymore :P It's really just about understanding what a block is, and the rest becomes much easier. With the new changes to rail displays in 0.16, I think it will be a lot easier to understand, as you'll be able to see each block quite clearly whenever you hold a signal in your hand. This is about as simple as I can explain it without using pictures or video. So in other words, if there are two "exit" signals from the block directly after the chain signal and only one is showing red, the chain signal will let any train that wishes to go past the other signal through. What makes it a bit more advanced is that blocks could have branching paths, and if a train wants to take a turn and it's only the straight rail that is blocked, chain signals will allow them to do so. It will display a red light to indicate this.Ĭhain signals "listen" to the next signal in line and will block incoming trains if there's any train in the block directly after OR if the next signal in line is showing red. Regular signals will block incoming trains if there's another train in the block directly after that signal, so if there's any train between the signal and the next signal. It's also annyoing that in the tutorial you can only see the rail sections when you are placing signals, but not when watching the trains.As has been mentioned, Factorio rails work on a "block" system. The main problem is that when you find a solution, its quite possible you just fluked it, or don't really understand the logic behind why it worked. Examples explaining multiple trains on curving tracks would be good too, rather than just shove you into a much harder tutorial level. I feel like they need to go through some of these later examples step by step, to show the player exactly what order a chain signal is looking at. Up until that point I thought they did quite a good job of showing how the chain signals worked. I feel like when the devs look at the tutorials again, it would be good if they looked at the last part of this one. Also if anyone has the optimal solution for this tutorial and feels like sharing the logic behind what each train is deciding in the answer, that would also be great. In these examples I don't understand why the chain signals are letting the train through, and also why they are still letting it through even though the chains are coloured red.Ĭan anyone explain? I feel like if I don't understand the logic, I stand no chance of figuring out how to use chain signals in the game. If any of them are occupied, the chain signal shouldn't let the train through. I thought that the first chain signal the cyan train hits should be looking at the path ahead, and seeing if any upcoming sections are occupied/red signal. Adding a chain signal opposite the red signal at the top also makes no difference. Note that the chain signal starts green in this case.Īnd same result if I put both chain signals down at once (both chain signals start off red). Restarting the tutorial, I tried placing a single chain signal further up connecting to the other section. Note that the chain signal starts off red if you put it in this position. No joy, the train carries on to the red signal. To stop the cyan train, I have tried placing a single chain signal along its path in the location where my cursor is. If you run the trains, the cyan train at the bottom travels to stop at the red signal below the top cyan train. Here is the example before any user interaction. Whatever I do, I can't stop the bottom cyan train using one signal and I don't understand why. This latest tutorial test I have made work but only by fluke.įirst of all I am trying to understand the logic, so maybe you can help me with this example. But with the curving, multi-intersection challenges, I am really struggling to understand how to place the chain signals, and figuring out the logic that each chain signal is following. The first few examples with chain signals I understood, and after a little while, I figured out the intersection challenges. Hi folks, just starting out with my first multi-train lines, so I hopped into the advanced rail tutorial.
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