London Bridge tube station had to be rebuilt as well (not too add a mezannine per se but just to have enough space to hold the passengers waiting for trains), i

London Bridge tube station had to be rebuilt as well (not too add a mezannine per se but just to have enough space to hold the passengers waiting for trains), in the late 90s to house Jubilee Line but also to expand the Northern Line platforms. Even this 20 years later looks too small. Both these lines operate every 2 minutes (Jubilee slightly more than every 2 mins in peak).