When Viktor is travelling into the city on the train, the internal shots show he is on a diesel powered V/Line train. However, as his train pulls into Southern Cross station, the external shots of the train show he is now on an electric "Metro" train. The internal shots continue to show him on a V/Line train, then the final external shot shows him stepping off the electric train and (even though in real life, it is plausible to switch between the two trains on that line). at no point in the story is there an explanation or logical reason to why he may have switched trains.