The new rail cars cannot navigate a steep curve on a stretch of tracks shared by the three lines because the part of the car that draws power from the third rail can raise up by about a quarter of an inch, General Manager Paul Wiedefeld said Thursday. That can lead to the entire train automatically shutting down as apparently happened in the tunnel outside Rosslyn last month.
He hoped analysis of “a lot of data” collected recently will allow Metro to identify a fix for the problem in the next few days that would then later allow the new trains to return to those lines after adjustments to the parts, known as “shoes.”
Wiedefeld does not believe the issue is significant in the long-term.
The transit agency now has 144 of the new rail cars and 128 of them operating in the system. The new trains are only running on the Red, Green and Yellow lines until the track issue is resolved.
Metro can still run eight-car trains made up of older cars on the Blue, Orange and Silver lines, although the Federal Transit Administration has raised concerns about the possibility that an increased number of longer trains in the system could add to the risk of smoke or fire incidents.
The 7000 Series cars have faced a number of other problems, from simple manufacturing issues to air conditioning.
Wiedefeld said Metro is now “on top of” those issues moving forward.