A huge Chicago Transit Authority construction job that North Side commuters could learn to both love and hate has received another $100 million in federal funds.

U.S. Rep. Mike Quigley, D-Chicago, today announced the funding for the CTA’s ongoing Red and Purple Line Modernization Program.

The most visible portion of the years-long program to rebuild much of the CTA’s busiest train line is scheduled to begin within days, with construction equipment arriving north of the Belmont station and, by early October, an enormous bridge—or flyover—taking shape. It will allow northbound Brown Line tracks to pass over Red and Purple line tracks.

The century-old Brown Line tracks now have to cross Red and Purple line tracks at the same grade at the Clark Junction, forcing a backlog of trains waiting for clearance.

When work is completed on the flyover and reconstruction of Red Line tracks by 2024, the CTA says it will be able to add several more trains each way during rush hour, times which train cars now often are filled to capacity. But there inevitably will be construction delays, and there has been some criticism in the Lakeview neighborhood of the size and impact of such a large elevated structure.

The $100 million award was expected. It came under terms of a long-term funding deal reached in the final days of the Obama administration in which the feds agreed to provide $957 million for the $2 billion project. Most of the rest of the money is coming from a special tax-increment financing district that collects funds on property located within a half-mile of the Red Line.

The CTA next year is to start work rebuilding and raising by as much as 10 feet the Red Line tracks from Lawrence to Bryn Mawr, and reconstructing elevated stations in that area.

The CTA still is seeking funding for Phase 2 of the project, north of Bryn Mawr.

U.S. Department of Transportation officials today also announced $13.5 million awarded to the Chicago Department of Aviation to build a taxiway at O’Hare International Airport.