Thanks for the feedback. I couldn't get the chain signals to work on the station entrances, but I found a workaround with regular signals, no crashes so far. Got a 5 row station now and oil, coal copper and iron coming in at a steady pace, actually more than my factory can churn at the moment.
The ...

So I got my factory set up, but my railway expansion is somewhat hampered by me not understanding the light positioning in loops and stations. Been hammering my head against this for like a solid 3 hours now.

First, I have no idea how to place lights in a multi lane station using this design ...