太子探花

Rail junction south of Union Station to shut down for 9 days in October, impacting Amtrak and VRE service

If you’re taking the train between D.C. and Virginia in October, expect some major changes.

Amtrak is planning a nine-day shutdown of A-Interlocking, a critical rail junction in the First Street Tunnel just south of Union Station. Every Amtrak train traveling south from Washington passes through the location, which funnels multiple station tracks into the two tracks that continue into Virginia.

鈥淓very train that comes through D.C. that’s traveling south goes through A-Interlocking,鈥 said Greg Michalski, Amtrak’s deputy chief of production construction.

The project is part of a larger effort to replace rail infrastructure that Amtrak says is at the end of its useful life. Crews have been making repairs and replacing components over the years, but Michalski said a full replacement is now the best option.

鈥淲e’ve been doing maintenance throughout the last couple years to maintain the tunnel, and all these assets have just reached their useful life span. They’re at the point of a complete replacement,鈥 Michalski said.

During the outage, crews will replace two double-slip switches and a rail crossing known as a diamond, key pieces of infrastructure that help direct trains through the junction. Amtrak will also install new electric switch machines, replace ballast beneath the tracks and address drainage issues in the tunnel.

The work can’t be done while trains are operating because crews will be removing a significant section of track as part of the rebuild.

鈥淭here will be no tracks to actually physically run a train on,鈥 Michalski said.

A-Interlocking inside First Street Tunnel just south of Union Station
Amtrak is planning a nine-day shutdown of A-Interlocking, a critical rail junction in the First Street Tunnel just south of Union Station. (WTOP/Mike Murillo)
A-Interlocking inside First Street Tunnel just south of Union Station
Amtrak is planning a nine-day shutdown of A-Interlocking, a critical rail junction in the First Street Tunnel just south of Union Station. (WTOP/Mike Murillo)
Amtrak train inside the First Street Tunnel
Amtrak plans to keep crews working around the clock until the job is complete. (WTOP/Mike Murillo)
Crews inside the First Street Tunnel
During the outage, crews will replace two double-slip switches and a rail crossing known as a diamond, key pieces of infrastructure that help direct trains through the junction. (WTOP/Mike Murillo)
(1/4)
A-Interlocking inside First Street Tunnel just south of Union Station
A-Interlocking inside First Street Tunnel just south of Union Station
Amtrak train inside the First Street Tunnel
Crews inside the First Street Tunnel

Amtrak plans to keep crews working around the clock until the job is complete.

鈥淲e’re going to work 24 hours for the nine days, 24/7 for the nine days until the project’s done,鈥 Michalski said.

The shutdown is scheduled for Oct. 16 through Oct. 26.

During that time, passengers traveling between Virginia and Washington will have to use alternate transportation. Some trains will terminate in Alexandria, where riders can transfer to Metrorail, while additional bus service will connect passengers from points across Virginia.

Virginia Passenger Rail Authority Executive Director DJ Stadtler said transportation agencies have been preparing for the disruption.

鈥淲e totally understand it’s an inconvenience. We don’t love it either, but we’re going to make sure folks have the options to get where they want to go when they want to get there,鈥 Stadtler said.

The outage will also affect Virginia Railway Express service. VRE will continue operating, but Union Station won鈥檛 be a destination.

鈥淒uring this period, you will not be able to take a train from Virginia into D.C.,鈥 Stadtler said.

Amtrak says much of the new track will already be assembled and tested before crews start tearing out the old infrastructure, helping them complete the work during the planned shutdown window.

Rail leaders say the temporary inconvenience should pay off in the long run by improving reliability at one of the most important rail junctions in the D.C. region and helping prepare the corridor for future growth in passenger rail service.

Get breaking news and daily headlines delivered to your email inbox by signing up here.

漏 2026 WTOP. All Rights Reserved. This website is not intended for users located within the European Economic Area.

Mike Murillo

Mike Murillo is a reporter and anchor at WTOP. Before joining WTOP in 2013, he worked in radio in Orlando, New York City and Philadelphia.

Federal 太子探花 Network Logo
Log in to your WTOP account for notifications and alerts customized for you.