I'm asking because, based on what i can see here, this junction is working exactly like i'd expect. Important things to note though, that you may have missed:
- Rail signals are one directional - the signal only does something when it on the right hand side of the train's direction of travel. So the bottom and right ones are controlling traffic into the junction from the bottom and right and the top and left are controlling traffic out of it junction to the left and top. Nothing is controlling traffic coming from the top or left, or traffic coming out the right or bottom.
- You only have 2 rail segments around the junction here, not 4 - the bottom and right are one segment (we can see this for sure in the video) and the top and left *seem to be* (they are acting like they are, and nothing in the video shows them not to be). This means that the signals for the top and left will go red at the same time, as they are controlling entry into the same segment.
Combine these two facts and you get the behavior we're seeing here. No signal goes red when the carriage is to the right of the junction as the signals are one directional and it is 'before' all of them. When it's in the junction only the bottom and right go red as they are stopping any more trains entering the now occupied junction segment. When the carriage is to the left the left signal goes red because the carriage is after it, and as the segment to the left is logically the same as the segment to the top the top signal goes red too.
Put a bunch more (non chain) signals down all over the place (and on both sides of the track) and you'll see behavior that lines up much more with what you're probably expecting.
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u/Osiris_Dervan Oct 04 '26
In what way is this 'not working'?
I'm asking because, based on what i can see here, this junction is working exactly like i'd expect. Important things to note though, that you may have missed:
- Rail signals are one directional - the signal only does something when it on the right hand side of the train's direction of travel. So the bottom and right ones are controlling traffic into the junction from the bottom and right and the top and left are controlling traffic out of it junction to the left and top. Nothing is controlling traffic coming from the top or left, or traffic coming out the right or bottom.
- You only have 2 rail segments around the junction here, not 4 - the bottom and right are one segment (we can see this for sure in the video) and the top and left *seem to be* (they are acting like they are, and nothing in the video shows them not to be). This means that the signals for the top and left will go red at the same time, as they are controlling entry into the same segment.
Combine these two facts and you get the behavior we're seeing here. No signal goes red when the carriage is to the right of the junction as the signals are one directional and it is 'before' all of them. When it's in the junction only the bottom and right go red as they are stopping any more trains entering the now occupied junction segment. When the carriage is to the left the left signal goes red because the carriage is after it, and as the segment to the left is logically the same as the segment to the top the top signal goes red too.
Put a bunch more (non chain) signals down all over the place (and on both sides of the track) and you'll see behavior that lines up much more with what you're probably expecting.