Watch the "All For You" video. During the first verse of the song (when Janet first comes out of the subway car)when she is with all her dancers(not just two) you will notice, if you look to the left and right of them, there are two subway cars. Watch them throughout that whole verse, you will see that both the cars end about where the camera is. When the group starts walking away, the car on our right goes forward and it is so long, but earlier in the scene it ended immediately.