I recently had a 24 hour stay in Seoul and decided to experience the train for the first time. While it might not be the most convenient for many it was a quick and relatively painless trip... but it did present certain hassles. Getting to the A'REX is well signed. It requires about 10 minutes of walking, toward the parking structures, but there are some travelators (which can be seen above). Two trains are available, the express, at W13,300, 43 min, and the commuter W3,800, 53 min. Departure times can be found here. Because it was getting close to rush hour I thought about taking the express train, but changed my decision when I realized that there would be a long wait for the next express (it was 3:35). I turned around 180o and went to the commuter entrance. The cost was W3,800 + W500 for the card deposit. A receipt was issued along with the card. Once through the entry this is what is seen: Heading down to the tracks: A rather nice station.