Train Tunnels

LA to SF in 2 hrs, 40 mins? That promise in the proposition that voters approved in 2008 could be the train's undoing, as to keep that schedule it will require more expensive design, including viaducts and tunnels, than would otherwise necessitate.
Dec 22, 2011   Los Angeles Times
This video from <em>The Boston Globe</em> takes a look into the world below the city's subway system.
Jan 7, 2010   The Boston Globe