New York City borough
Manhattan is one of the five boroughs of New York City, geographically smallest but most densely populated in the city. Wikipedia
Dr Michael Horodniceanu, the man in charge of extending Manhattan's Subway tunnels, explains how the daily commute will get easier for New Yorkers from 2019.
3:12PM GMT 07 Feb 2013
Expansion projects, costing at least $15 billion, are under way to improve New York's Subway system by 2019.
"We have not done something like this for eighty years," said engineer Dr Michael Horodniceanu, head of capital construction for the state Metropolitan Transportation Authority.
Sixteen storeys below New York's famous Grand Central Station, workers are building a new 350,000-square-foot underground concourse to accommodate Long Island Rail Road Trains as well as subway services.
"What you see here right now is the start of the next 100 years for Grand Central, because what we are doing is we are building here for the future," said Dr Horodniceanu.
Meanwhile, to the east of Manhattan, the Second Avenue Subway is being built to ease congestion for commuters.