 The tunnel required more than 50,000 cubic yards (38 227.75 m3) of elevation, 4,000 cubic yards (3 058.22 m3) of concrete and 1.25 million of bricks to line it.With the exception of the tunnel in Fairmount Park in Philadelphia, which was in diameter, but only long, the Broadway Tunnel was the widest tunnel of its type in the U.S., and possibly in the world, at that time.According to an article in the "Los Angeles Times", the Third Street Tunnel, which was also nearing completion at the time, could have been put inside the Broadway Tunnel leaving enough room for a sidewalk wide.