In today's new puzzle we're in Seoul, Korea waiting for a train. The Seoul Metropolitan Subway system consist of 22 rapid transit, light metro, commuter rail and people mover lines. The network consists of numbered lines 1 through 9, which serve Seoul City proper and its surroundings and other specifically named regional railways that serve the greater metropolitan region and beyond. The first line of the Seoul Subway network started construction in 1971. Typically, train cars (like the ones in this puzzle) have four doors on each side. In between the doors are rows seats for 7 people, except for the outer ends of each wagon where there are smaller rows of seats for 3 people, marked for the use by the elderly, disabled passengers, and pregnant women. All trains are 19.6 meters in length, 3.12 meters in width, and 3.8 meters in height.