Los Angeles' growing public transit network is receiving another big dose of cash from the federal government.

The office of Sen. Barbara Boxer says that on Wednesday, federal and local transportation officials will sign a $1.25 billion grant for the Los Angeles County Metropolitan Transportation Authority to extend a subway line into Beverly Hills. The project also will receive a $856 million federal loan.

The money will help build four miles of new track, which is projected to be completed in nine years.

After that, Metro wants the Purple Line to go under Beverly Hills and end on the west side of Los Angeles.

Opponents of the extension have sued, saying the tracks should not go under Beverly Hills High School.