The MTA’s board unanimously approved a $2 billion tunneling contract with a joint venture between Halmar International and FCC Construction for the northward expansion of the Q line Monday,

The transit agency inked a nearly $2 billion contract on Monday to begin major construction work on a subway line that's been floated for a century.

The contract, which will award nearly $2 billion to construction firms, funds crucial aspects of the latest phase of the long-awaited subway expansion into East Harlem.