I can’t say whether this is due to the update or the issue was already there in the previous version, because I’m on a new save. I noticed some odd train behavior though, which might be related to the new pathfinding.
I have a lot of train stations connected to my main circuit and in most stations, the trains would like to take the detour through the station rather than the obviously shorter track on the main route. A picture says more than a 1000 words, so here you are:
The train in the screenshot has no business in that station yet insists on going that way. This seems to be a problem of the train tracks+station, not of the trains themselves. All trains will consistently go through this station rather than the short way you can see below the station. There are even more extreme detours than the one in the screenshot. Trains do this for most of my stations, but not all. A few stations work normally. In my old save of the previous version I remember all trains behaving normally.
Another weird thing is how they transport some goods. I have one station that is producing only sand and there is nothing else connected to the roads of that station. There is another station which only has microchip factories connected to it. I have a train route stopping at the sand station and going to the microchip station. Then, the sand trains unload all sand at the microchip station as you would expect, but the station does not send all sand to the factories. Instead, some stays in the station until another train from my electronics train line comes to deliver electronics to the microchip station. Then those trains pick up some sand and send them god knows where (I think they actually deliver it back to the same station, but not sure on that one). Might just be a case of the sand somehow wanting to reach my concrete factories through a very obscure route, but I’m still quite confused.
My third point is maybe rather a lack of understanding so I am curious to know why this works the way it does. Let’s look at some train tracks with signaling highlighting:
The main track is running from left to right through the screenshot. The 5 red spots are, in this order: merge, split, merge, merge and split. I can understand why there is an orange section before a merge, like on the left edge of the picture. But what I don’t get is why there are orange sections after a split, like in the middle and in particular on the right edge of the picture. How are trains supposed to block each other after the tracks diverge? I have several splits with long stretches of orange on one or both outlets. In my opinion they shouldn’t even be red, as nothing can collide here. On the other hand I sometimes have merges with minimal orange parts, like this one:
What is going on and why?