Avenue. (Bus Service started operating on September 27, 2010). The bus had two routes: The Q Express runs between MARTA's Kensington Station and a free 150-car Park-and-Ride lot at Goldsmith Road & Memorial Drive; The Express only stops twice along the way at North Hairston Road and again at Georgia Perimeter College. The Q Limited also ran north along Memorial Drive from Kensington Station but branched off at North Hairston Road on the way to East Ponce de Leon Avenue. The Q Limited had four stops along the way in addition the same stops for the Express. The implementation of revenue-collecting service had initially been planned for early 2009. Due to low ridership, BRT service was discontinued. Atlanta BeltLine Additionally, several traffic corridors are currently being studied by MARTA for possible system expansion. The BeltLine is a current proposal for the use of light rail and possibly bus or streetcar service on existing railroad rights-of-way around Atlanta's central business districts. The conversion of existing rail right-of-way to the proposed BeltLine also calls for the creation of three additional MARTA rapid transit stations where existing lines intersect the Belt Line at Simpson Road, Hulsey Yard, and Murphy Crossing. Clifton Corridor Rapid transit alternatives are as of October 2011, under consideration for the Clifton Corridor, from Lindbergh Center, following the CSX rail corridor to Emory University and the Center for Disease Control, with possible continuation along the northern edge of Decatur on to Avondale MARTA station. Bus, light rail and heavy rail rapid-transit options had been considered, with light rail being selected as the preferred option. Connect 400 The Georgia 400 Transit Initiative (also known as "Connect 400") is a MARTA project to study options for expanding high-capacity transit along the Georgia State Route 400 corridor into the northern reaches of Fulton county. The initiative, kicked off in December 2011, envisages an 11.9-mile extension of rapid transit service, starting in the south at North Springs Transit Station, the current terminus of the existing MARTA Red Line. From there, such an extension would continue northward through the cities of Sandy Springs, Roswell, and Alpharetta, terminating in the vicinity of Windward Parkway. As of the fifth public meeting on the subject on September 26, 2013, the study had narrowed the field of transit technology alternatives to three, all using existing right-of-way along SR 400: heavy-rail transit (HRT, extending the Red Line northward), light-rail transit