Oh, boy -- a neverending story!
Me:
There are several rails (e.g. BI's wooden bridges, the bridges from Beautiful Bridge Railway, or the waterways from Cargo Ships) that shouldn't be relevant to your mod because your roads certainly aren't placed on water.
Klonan:
I change the collision layer of the rails so that you can build rails on the transport drone roads.
Adding object layer to the rails will mean that they cannot be built on the roads, which severely impacts the usage.
So Klonan messed with the collision masks of all rails by removing "object-layer". I know for sure that the bridges from Beautiful Bridge Railway only had "object-layer" in their collision mask (I think we had either exactly the same or at least a very similar problem, but I reported that to BBR's author in response). So, when Klonan's mod removes the only layer in their mask, the bridges don't have any collision mask at all and can be built literally anywhere: on water (as expected), but also on cliffs (and I guess on top of assembling machines, transport belts and all other entities as well).
Obviously, our mods have contrary objectives (Klonan's wants to make rails that won't block his drones, I want my bridges to be placeable in a sane way). So, I'm almost inclined to add a conflict against Construction Drones, but I'm afraid a lot of people would not be happy if I did that.
