the Gyeongui–Jungang Line. Around 2015, a large bus transfer center was built in front of the station's main entrance. It has about nine platforms that services different bus routes in Seoul. It is separated from the main roads with a barrier around the platforms. Yet having a rather complicated structure with many bus platforms, the transfer center is built in a simple manner as it is not a separate terminal building. Station layout Korail AREX ↑ Terminus ↑ Gongdeok ↓ / Incheon Int'l Airport Terminal 1 ↓ Platform numbers are not assigned; instead, platforms are classified as "express" or "local" Platform layout (AREX) Seoul Metro Platform layout (Seoul Metro) History The former Seoul station, Namdaemun Station, started operating in a 33 m2 (10 pyeong) wooden building in July 1900 with the extension of the Gyeongin Line north of the Han River. The Gyeongbu Line opened in 1905, and the Gyeongui Line opened in 1921 – both lines connecting to the station. The construction of the current "Old Seoul Station" began on June 1, 1922, and was finished on September 30, 1925. In 1923, the station reverted to the name "Gyeongseong Station," when the name of the city of Seoul changed from Hanseong to Gyeongseong ("Keijo" in Japanese). The station was renamed "Seoul Station" on November 1, 1947. The station was expanded throughout the post-Korean War era; the Southern Annex of Seoul Station was completed on December 30, 1957, and the Western Annex was completed on February 14, 1969. In 1975, the Korea National Railroad's office moved from Seoul Station to the new West Annex office. A raised walkway connecting the Seoul Station and the West Annex was completed in 1977, and Korea's first privately funded station was erected in 1988 in time for the Seoul Olympics. In 2004, a new terminal adjacent to the existing one was completed to coincide with the introduction of KTX high-speed rail service. Old Seoul Station The old Seoul Station (, literally meaning "old Seoul Station building"), also known as "Culture Station Seoul 284" (), originally named Keijo (Gyeongseong) station and designed by Tsukamoto Yasushi of Tokyo Imperial University, was finished in November 1925. This red brick building, designed in an eclectic style, features a Byzantine-style central dome and a centralized and symmetrical layout. The floor of the Central Hall on the ground floor was covered with granite and the walls were covered with man-made