There’s a rather good program on the iplayer at the moment about infrastructure projects by that nice man Evan Davis off the radio:

http://www.bbc.co.uk/iplayer/episode/b01nd243/Built_in_Britain_Episode_1

It features the BORING MACHINES Ada and Phyllis (they’re German apparently). Blodgett recently alerted me to this excellent website which plots daily the current location of BORING MACHINES!