The game crashed when I tried to add a rail where there already were 4 segments, also it was being by several trains. There is another junction like this (this one was being used too), I tried adding the new line there and it crashed again. Then I tried adding the rail with the trains set to manual ...

Hi,
I found a bug regarding Natural Evolution Enemies and rail dipslay on the map: It can be easily fixed by adding the "player-creation" flag to the 123. and 124. lines in the data-updates.lua file.