Yesterday I bought the latest London Overground DLC, Mildmay line: Stratford - Willesden Junction and I noticed none of the passengers getting on or off the train for the entire route. I see similar things in other DLCs throughout the game such as a major terminal as London Victoria having no passengers getting off, when I would expect such a station to have hoards of people racing to the ticket barrier line. However at Brighton, the NPCs work as I would expect, it seems odd that its not the same for London. Then there is the matter of NPCs already being on a train before it goes into service or seeing NPCs packed in a train on a siding... immersion is dead if NPCs look so wooden and unrealistic. Not to forget the way they move and looking like something from Shaun of the Dead as they gather at the bottom of a staircase or obstruct passage along the platform.
@Asheix NPCs in TSW have been causing drama and problems for a very long time. But for DTG, this is only a minor issue that they will probably never update.