I downloaded and installed the latest version of the P&LE Route from the file library. After running an RW_Tools check of the route, I discovered that RW_Tools reported a missing track item (30m turntable) that is located in this folder:
C:\Program Files (x86)\Steam\steamapps\common\railworks\Assets\RailNetwork\Turntable\30mturntable\30mturntable.bin
I created the 30m turntable and it is a Developer - Addon asset. It has no business being copied and pasted into the asset folder that the route has it in.