The lines, tunnels and bridges were repaired and rebuilt by hand.
The trains, however, are nearing full capacity, and many rail lines, tunnels and stations need to be upgraded or replaced, the railroad said.
But somewhere under the ground — in the snarled archaeology of cables, lines, tunnels, tubes, co-ax, copper and pipes — there are now pliable, beautiful, clear fused-silica tubes guiding light waves from communications centers right to our houses.
It is an argument that has been made for the last 70 years, during which time countless other road networks have been extended, tube lines tunnelled, wobbly bridges built and novelty cable cars erected.
Special attention is focused on the restoration of the L Line Tunnel, which was flooded by Hurricane Sandy.
The current enhanced model takes into consideration the curvature of an arched roof of a lined tunnel.
Mr Keith explained that the intended targets were revealed in a note inside Lindsay's passport, found in a Piccadilly line tunnel.
Transit officials estimated that 1,000 feet of the No. 1 subway line tunnel beneath the World Trade Center, including the Cortlandt Street station, had collapsed.
The maximum uplift occurs at the pit center, and the uplift of the right-line tunnel is bigger than that of the left-line tunnel.
As built, for ease of passenger access, the branch's northbound tunnel ended in a dead-end platform adjacent to the northbound main line platform with the branch's southbound tunnel connected to the northbound main line tunnel.
