Metro officials say the entire rail and bus systems will be closed this weekend due to the major snowstorm expected in the region.

Officials said they believe it is the longest closing in the system’s more-than-40-year history.

Buses will run only on major corridors throughout the day Friday and will stop running at 5 p.m. Trains will run normally during the day, then stop running at 11 p.m. Friday.

Service will not resume until at least Monday morning, officials said Thursday afternoon.

General Manager Paul Wiedefeld said in a statement: “The actions we are taking today are all in the interest of our customers’ and employees’ safety, and will help us return to service once the storm passes and the snow is cleared.”

Metro said that it will use its tunnels to store railcars during the weekend to protect them from damage from the weather.

The MetroAccess program for transporting people with disabilities also will stop making outbound trips at 1 p.m. and cease all service at 6 p.m. Friday.

Read more:

How to prepare for this monster storm

How to protect your house, car and pets

The laws and fines for not shoveling snow in the D.C. area