So yeah, this lighting effect is....curious. It's like the train becomes completely detached from the lighting system for the tunnel, and begins flashing and strobing. Video: https://1drv.ms/v/s!AmUam9bd9z-N7HqjImuU4U5LqnxR
That strange blue light was present in the old sehs, wasn't that bad though. I've noticed those little white pin holes you have mentioned on the sides of trains in the dark aswell. If I change the filtering it goes away but in turn brings on a horrible flickering effect with distant objects in the day time.
I believe there is a fix being tested for one of the tunnels that causes the lighting to go crazy and start flickering - is this what you are talking about?
Oops - missed the video, thanks. But yeah, there is a fix in testing - hopefully it will be released soon!