The transportation agency has mortgaged itself to the hilt to rebuild the World Trade Center, leaving few resources for its real mission. New Yorkers have watched One World Trade Center gradually define the downtown skyline. The massive glass-and-steel building should reach its full height and be ready for tenants within 18 months. But to those tenants, One World Trade may come to symbolize not victory over terror but rather their own miserable commutes. Most of the white-collar workers who will stream into the tower depend on subways, buses, tunnels, and bridges to get to Manhattan. And over the past decade,...