Pretty self-explanatory. The train for some reason randomly darkens even though it's not under anything.
Yeah I also encountered that, hopefully that's easy to fix when the Preserved Crew gets around to SKA.
This problem is caused by the tunnels underneath the line you are riding on, the darknes from the tunnel is "leaking" out. Same problem on the Great western line near Reading. Tunnel lightning seems an issue in TSW, like SEH and Arosa
