 Matt Koufax, WTOP News. Metro is reworking shuttle service out of the Silver Spring Transit Center. Starting Monday, Metro will adjust its shuttle bus service to improve travel times and reduce bus congestion. Right now, the Red Line Limited 2 shuttle bus loop travels from Forest Glen to Silver Spring to Fort Totten and those travel times have taken longer than originally estimated. Now, two new express shuttle loops will replace the Limited 2 service.