In the case of the NYC, class lights were used to dictate what the train was doing at that given time they’re illuminated, green was a regularly scheduled train possibly followed by a second segment, in both cases, all would be green,
Not quite. The first section of a "regularly scheduled train" would have displayed green class lights and green flags, to indicate that a "second section" was following. If additional sections were required, then those successive sections would also display green class lights and green flags. When the actual "timetable scheduled" passenger train came, it would be display NO illuminated class lights nor flags.
....white or actually clear, was an “extra” or a non scheduled added train ........red MARKERS are on the back of a locomotive or on the tender to indicate the end of the train, ...or MARK the location of the end....class lights became non-existent on NYC steam as better and better train control systems were put in play....as the shrouding came off of streamlined locos, there was no point wasting time putting class lights back on as they were not really needed with better train control systems, and controllers knowing better why and where trains were......Jack, did make any mistakes?...correct anything if I’m wrong....