For many people in the D.C. region, this coming weekend will be three days long, because of the Veterans Day holiday on Friday. So Metro is planning a lot of track work, particularly on the Green Line, starting Thursday night and continuing through the train system’s midnight closing on Sunday.

But Veterans Day is one of those in-between holidays, like Columbus Day. Many people, particularly federal workers, have the day off. Many others do not. This Friday, expect extra crowding on the Green Line.

Here are the details about the weekend delays.

Green and Yellow lines

The key element in the weekend work is replacement of track switches on the Green Line in accordance with recommendations made by the National Transportation Safety Board.

From 10 p.m. Thursday through midnight Sunday, free shuttle buses will replace Green Line trains between L’Enfant Plaza and Southern Avenue stations.

Waterfront, Navy Yard, Anacostia and Congress Heights stations will be closed. The Green Line train service will be split into two sections, with one operating between Greenbelt and Huntington and another between Branch Avenue and Southern Avenue.

Two types of shuttle bus services will bridge the gap. A local shuttle will operate between L’Enfant Plaza and Southern Avenue, making stops at Waterfront, Navy Yard, Anacostia and Congress Heights.

An express bus will operate between L’Enfant Plaza and Southern Avenue, making one intermediate stop at Anacostia.

The last train will leave Branch Avenue 20 minutes earlier than usual at 11:04 p.m. Thursday, 2:04 a.m. Saturday and Sunday — that’s the end of the Friday and Saturday night owl service — and 11:04 p.m. Sunday.

Add 30 minutes to your normal travel time if taking the shuttle buses.

Yellow Line trains will operate between Huntington and Greenbelt throughout the weekend.

Red Line

From 11 p.m. Saturday through the train system’s closing, Shady Grove and Rockville stations will be shut for signal repairs.

Free shuttle buses will operate between Shady Grove and Twinbrook, making a stop at Rockville. Riders using these buses should add 15 minutes to their usual travel time.