
The NYC subway and rail system is one of the oldest in the world, but it is still expanding. A new tunnel has just been completed into Grand Central Station that will bring Long Island Railrod (LIRR) lines into the station. Beginning in 2007, this project has been a painstaking process of burrowing into the rock beneath Manhattan with the help of two 200-ton, 22-foot-tall tunnel boring machines.
The machines are so big and the process is so laborious that the machines themselves are extremely worn by the end of the project–so …








