Train collision issue help

[atadeadrun]

I've got an ongoing but rare issue where trains will wreck at one of my train station junctions. It only happens every couple hours, so I've yet to be near it when it happens. That said, that intersection is one of the busiest in my factory and it's only going to get busier, as a lot of subfactories are planned on the far side of what is currently the major portion of my factory. I can't figure out what's making it happen, and no changes to the set up have kept it from reoccurring. The junction in question is the entrance and exit from a station. The main line is north-south between the two lakes in the southwest of the map, and the station extends away to the east. The collisions keep occurring when northbound passing trains hit trains exiting the station southbound.

In the linked image, red circles are path signals, green are block signals, arrows denote direction of travel, and the orange box is where the collisions happen. Apologies for the crude MSPaint work. Any suggestions are welcome, as I'm getting tired of having to go rerail trains. Thanks!

Image of intersection[imgur.com]

[LittleEngineer]

I think you have drawn the lower junction the wrong way, as following the convention no trains from any direction would be able to enter it.

I know it would be a major bottleneck, but you could try to temporarily swap the path signals for block signals.

Or, if you have the space, redesign the junctions as grade-separated junctions (flying junctions)[en.wikipedia.org] where you wouldn't have any collisions between the directions and possibly lower the chances of a future bottleneck.

[aRPeaR]

You could try moving the northbound block signal, so it can stop/block a train, but not block the intersection with the length of the train.
I presume that the whole intersection is one color (made visible when placing signals).
Raising the track between the northbound entrance and exit would be a fix and it will increase the capacity the intersection can handel.

[Akarin]

Don't use path signals ever, they simply do not function correctly in the game at the moment and they will either halt a train for no reason forever or as you experienced straight up fail to do the thing they are designed to do.

[Chris Solomon]

i am using path an block signals on my rail system. it works great at preventing collisions. it also allows me to have multiple trains on the same rail line with no collisions

[Arch]

From the diagram, it looks like your interchange has *potentially* 4 entrances and 4 exits, with the entry/exit combined into a single track on the horizontal paths and separated onto different tracks on the vertical paths (i.e., 6 tracks, but 8 possible paths in total due to two 2-way tracks). So that would indicate to me you need a total of 8 signals: 4 path signals for when trains enter the interchange and 4 block signals for when they exit. Since you've only got 6 signals in the diagram, I think this might be where the problem lies.

Signals are directional, so I would suggest that at the location of the single signals on the two horizontal paths, place two signals: a path signal along the entry to the interchange and a block signal along the exit of the interchange (at that same division in the track). Even if it's not possible/intended for the trains to travel in a particular direction, I'd put the signals in there anyway, because the presence of 2-way tracks in the network can make routes theoretically possible that you would never actually use, and that could mess up the signaling/pathing.

My rail network uses only 1-way tracks, so this approach may or may not work in your situation. But I've got around 10 roundabouts all demarcated with path/block signals on the entries/exits and they have been working fine for dozens of hours. I've actually observed two trains pass each other on the same roundabout without collision, and other times one train would wait when a train occupied part of the path it wanted to take, so I'm pretty sure that it's not the case that pathing signals don't work at all.