Arts Center to North Avenue on MARTA

We are at Arts Center on MARTA, where we watch a couple of trains arrive at and depart from the station on the Red and Gold Lines. Southbound trains head to the Airport. Northbound Red Line trains head for North Springs, whilst northbound Gold Line trains head for Doraville. After awhile, we get on one of the trains to Airport and ride down to North Avenue. The cars seen here are CQ310's, CQ311's, and CQ312's, the CQ310's being the oldest. Enjoy the view of the trains, as well as the acceleration sounds, which are similar to the R142's on the 6-Train and the R143's on the L-Train in NYC. If you have any questions about the video, feel free to message me. Comments are welcome. The videos were taken on June 3rd, 2014.

[ejdsndnj]

0:42 is that a 4 car train on the gold and red lines? I thought those were only used on the green lines