There are graphical artifacts on the pumps that are connecting a rail at north when they are idle.
My graphics settings if they matter:
I noticed this since 0.17.59.
Found a reddit post reporting the same thing for 0.17.38.
Rolled back to 0.16.51 to capture the correct form of pump-to-rail, but also encountered these artifacts!
So I can't tell which version this bug started existing.