Looks like an increase to 80K http://www.express.co.uk/sport/foot...ium-extension-Old-Trafford-Sir-Bobby-Charlton
For the sake of 7,500 seats and having to span a railway and the cost of everything that involves what they should do is get a designated standing area at one end, take out the seats and put in perfectly safe and well managed standing which will increase capacity in itself and then reduce the cost of a ticket in that area, making it more accessible for local walk up fans (even if the reality is they still have to get a ticket in advance from the ticket office). Give some standing back to alienated local support who otherwise can't afford to go week in week out, if at all.