Not sure you can expect a single unit to fix every single problem. The point of £6.5bn worth of work is to deal with the overcrowding where one rain cannot cope with every single person. Again I refer back to posters from others that you'd have to wait for up to three trains to board a train. So one single unit is dealing with two trains worth of passengers and your questioning the effectiveness of the investment? You do realise you cannot expect to reasonable get four trains worth of passengers on a single train! That's just stupid!