With a low groan, the train lurches to a halt at the platform. As its cargo strides out, its new passengers traipse in. With a blast, the doors shoot inwards from their positions, before grinding to a stop as its black lips kiss. The hum of the air-conditioner a low Concert G, the train slowly creeps out of the station and crawls along the rails, lazily drifting in and out of the stations on its travel route.