Lego gauge and wagons?

Hey guys, I’ve finally turned into an AFOL, after having put all my Lego in storage for years for the day that I’d have kids old enough to play with it. He’s 3, almost 4 and we’ve had great fun so far. Father Christmas has been so kind as to gift him 60198, which is an absolute hit. I’ve managed to buy the 60197 secondhand twice fo a decent price! (I wanted two streamlined locs), one will be canabalised to motorise the Christmas train (10369) for our Christmas village that my SO have been...