The Howard Street Tunnel fire (also known as the Baltimore Freight Rail Crash) was a 60-car CSX Transportation freight train derailment that occurred in the Howard Street Tunnel, a freight through-route tunnel under Howard Street in Baltimore, Maryland, on July 18, 2001. The derailment sparked a chemical fire that raged for five or six days and virtually shut down the downtown area. In the evening of the first day, a water main ruptured causing significant flooding in the streets above. The accident disrupted Northeast Corridor rail service. It also slowed Internet service in the US for several hours due to the destruction of a cable passing through the tunnel.