I've been exploring the Mk3 carriges on the West and Somerset route and one of the carriges is a Guard's carrige. I'm no expert on it but by the looks of things he has some control over the train. He also I remember steps out at every station and when it's time to leave he blows his whistle to notify the driver at the front he's good to go now. An exciting feature for TSW that will take a bit to perfect. in TSW it will be best to have around 20 diffrent sound recordings of whistle blowing, some could be short, long.....it can get really technical. Also just so we don't hear the same noise every time. He's going to be a very hard working guard AI. I am not sure how stable the AI are right now so in the beggining he won't have any control over the train, just steps out as the train loading begins (appears to be working hard) and when the loading has finished and you as the driver close the doors he would blow the whistle step back into his seat and be ready to do it all over again.