Today, L.A. Metro’s subway tunnels connect some of the city’s most densely populated neighborhoods. There are many other ...

A train breakdown in the Gotthard Base Tunnel meant passengers had to be led to safety through an emergency link between the ...

Completed in 2016, this engineering marvel has transformed European transportation and delivered significant environmental ...

Regional planners have again narrowed their recommended alternatives for a possible train tunnel through Del Mar. San Diego Association of Governments officials said Tuesday they support four ...

and bored or dug through a mountain, hill, or an underground space. Surprisingly, there are no driving or railroad tunnels in the San Bernardino Mountains, but there is a fascinating and historic ...