Here are some things that might affect your travels in the D.C. area this weekend:

Red Line

Free shuttle buses will replace trains between the Silver Spring and Fort Totten stations this weekend, the next-to-last major disruption on Metrorail’s Red Line scheduled for 2013.

Crews will be working on the tracks and the third rail between Silver Spring and Fort Totten from 10 p.m. Friday through Metrorail’s midnight closing Sunday. The Takoma station will be closed. On the open sections of the Red Line, trains will operate every 10 minutes from 9 a.m. to 9 p.m. Saturday and Sunday. At other hours, they will operate on regular weekend schedules.

The shuttle buses will provide express and local service. Express buses won’t stop at Takoma; the trip between Silver Spring and Fort Totten should take about 15 minutes. The local will include an intermediate stop at Takoma; allow about 10 minutes to travel between each station.

The last Red Line train of the night from Glenmont to Silver Spring will leave 27 minutes earlier than usual. On Friday and Saturday nights, it will leave at 2:10 a.m. On Sunday, it will leave at 11:10 p.m.

Green Line

Crews will be working again on the test track for Metro’s new rail cars. This will affect weekend service at the Greenbelt station.

Between College Park and the line’s southern end at Branch Avenue, trains will operate every 12 minutes from 9 a.m. to 9 p.m. Saturday and Sunday. But at Greenbelt station, trains will arrive and depart every 20 to 25 minutes, because of the work zone near the north end of the line.

Greenbelt is a popular station because it’s just off the Capital Beltway and has a huge parking lot, but because of the weekend work, travelers might want to use the Green Line’s College Park station or start at the Orange Line’s New Carrollton station, which is just off the Beltway a little farther south.

Early opening

On Sunday, Metro will open at 5 a.m., two hours early, to accommodate people heading to Pentagon station for the Army Ten-Miler. If you’re driving, watch for race-related road closures throughout the event.

—Robert Thomson