As the title suggests, I have come across an AI Class 66 in DB livery (probably one of the newer ones) on Great Western Express. Its headlights were extremely bright. I mean not a notch too bright or so. It looked like a 1,000 suns. My guess as a layman is that the new loco with ToD4 does not work together well with this very old route.
GWE does keep on spawing AI class 66 locos from TOD4 routes, I can't wait for this route to get it's update.
This is an issue with the WCML class 66 as it's using the newest lighting system and it unfortunately happens on all of the older routes. seems to work ok on MML so I use her there and the CL#2 class 66 everywhere else - those LED backlit guage clusters are (edit: emoji don't work, why would they lol) 'chefs kiss'