It must be a trick of perspective, but those tunnels look so small it's hard to imagine a train barreling through them. Details from Wikipedia: "The cross sect

It must be a trick of perspective, but those tunnels look so small it's hard to imagine a train barreling through them. Details from Wikipedia: "The cross section of a tunnel face was a 16-foot-wide (4.9 m), 16-foot-high (4.9 m) oval with an 11-foot (3.4 m) vertical wall."