U.S. Transportation Secretary Anthony Foxx is planning to visit Massachusetts to formally announce the federal government's commitment to the planned extension of the Green Line MBTA line to Somerville and Medford.

Foxx will participate in a press conference Monday at Somerville High School with Gov. Deval Patrick, Congressman Michael Capuano, and MBTA General Manager Beverly Scott.

Federal officials have promised nearly $1 billion to the public transportation project.  

The project calls for the construction of six new stations, the relocation of one existing station, the purchase of 24 new light rail vehicles, and the construction of a new bicycle and pedestrian path in Somerville.

The project is estimated to create 140 design jobs, 700 construction jobs during peak construction years, and 140 ongoing maintenance and operation jobs.