Second Avenue Subway has the Brits beat (Score 1)

The Second Avenue Subway in NYC was proposed in 1929, began tunnelling in 1972, then stopped in 1975, restarted in 2007. You can see pictures of the tunnel here:

http://www.thelaunchbox.blogspot.com/2012/03/contract-one-nearly-done.html

Picture of TBM

Keep in mind these pictures are taken from several feet below the active traffic on Second Avenue.