I was just playing this today when i noticed the colour of the train changing. There's an area of different lighting the train is passing through. You can see the train has a line of colour change on its side. I initially thought there may have been a weird light source. I've not tried to replicate in game so not sure if this is tutorial only. This is TSW3.
Something similar happened in TSW2, not sure if identical but I've certainly seen that harsh line between lighting effects before at Manchester Victoria on NTP, and something similar but much less pronounced on West Cornwall Local when leaving Penzance.
