Samgakji Station is a subway station on the Line 4 and Line 6 of the Seoul Metropolitan Subway. The Seoul War Memorial is a short walk away from exits 11 and 12. This station is on the west end of the Yongsan Garrison, which is a short walk from exit 13. Although not connected to this station by a transfer passageway, Namyeong station on Line 1 is a short walk from here.

Seoul Subway Line 4 of the Seoul Metropolitan Subway is a long line crossing from the southwest to the northeast across the Seoul National Capital Area. The central section in Seoul City is operated by Seoul Metro with some trains offering through service to Korail's Ansan and Gwacheon Lines. The southern terminus (Oido) is in Jeongwang 4-dong, Siheung City, and the northern terminus (Jinjeop) is in Jinjeop-eup, Namyangju-si, Gyeonggi-do; the newly built northern section is correspondingly owned by a company owned by Namyangju-si, with operations contracted to Seoul Metro. In 2022, the Seoul Metro operated section had an annual ridership of 219,587,000 or about 601,608 passengers per day.