Metro officials are investigating a cracked rail on Metro’s Red Line, which forced trains to share a single track for nearly two hours during Wednesday’s morning rush and led to lengthy delays for riders.

Metro officials said they are examining the cause of the crack on the third, electrified rail on the outbound track between the NoMa-Gallaudet and Rhode Island Ave-Brentwood stations and whether it was related to last weekend’s track work in the area.

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