It is the subway's first system-wide closure for non-weather-related conditions in 40 years of operations, Metro chairman Jack Evans said yesterday, admitting it would likely trigger transport misery for hundreds of thousands of commuters and tourists.
The metro system -- the second busiest in the United States after New York -- serves about 700,000 customers a day in Washington and the neighboring states of Maryland and Virginia, where many commute from into the capital.
"We will suspend rail service for 24 hours to inspect 600 underground jumper cables. The entire rail system will be closed until 5:00 am (local time) Thursday," Paul Wiedefeld, general manager of the Washington Metropolitan Area Transit Authority, told a news conference.
It is the latest bad publicity for the Washington Metro, which has 91 stations and began operating in 1976.
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In January last year, a woman died and dozens of people were injured after thick smoke filled a metro tunnel during evening rush hour due to an electrical malfunction.
Then on Monday this week, a cable fire erupted in a tunnel, sparking major delays on three lines -- and ultimately the decision to shut the system down.
An investigation was still under way, Wiedefeld said, but "commonalities" were found between Monday's fire and the deadly January 2015 incident.
"While the risk to the public is very low, I cannot rule out a potential life-safety issue here and this is why we must take this action immediately," he said.
"I fully recognize the hardship this causes to the region and to the community."
Many in the US capital rely on the Metro, which has six color-coded rail lines, to get to work or visit tourist sites.
But residents frequently complain about delays, long waits, station closures and weekend disruptions caused by scheduled track work.
Evans admitted that the decision would cause "a lot of congestion."
"It's going to be very difficult, we recognize, for people to get in to work, for school children to get to school, for everyone who relies on Metro.