Not the entire Second Avenue Subway line of course! Only Phase 1 encompassing four stations at 96th, 86th, 72nd and 63rd Streets in Manhattan!
Phase 1 will be completed at a cost that runs in the neighborhood of $4.5 billion, relatively inexpensive when compared with the projected Phase 2 cost of $6 billion.
‘The total length of the Phase 2 project, from 96th Street and 2nd Avenue to 125th Street and Lexington, is about 2.7 km. At $2.2 billion per km, this sets a new world record for subway construction costs, breaking that of the first phase of the same line, which only cost $1.7 billion per km.’ (Source)
He can be reached at email@example.com or at 516.741.4723.Google+