If you zoom in on the conductor of the train you can see him giving the "sign of the horns" to the photographers. I know it can mean different things in different cultures, so I'm choosing to think he meant "rock on", like it is used by heavy metal music groups.
@jmadhavadas Thanks for the complement! I like the scheme too, but unfortunately it belongs to the previous company that owned the railroad so who knows how much longer it will last.