Via WaPo’s Get There blog, an alert for MARC Penn Line Riders: major electrical system damage near Landover has left only one of three tracks open for inbound and outbound commuter trains, so MARC’s going to be a mess.

MTA MD’s official MARC alert page says Metro will honor MARC tickets to New Carrollton to get past the rail bottleneck.

Baltimore-bound riders may also want to consider the Camden Line tonight, or, as a last resort, the Green Line to Greenbelt, then B30 Bus to BWI, and Light Rail from there.