Manufactured by Daewoo Heavy Industries. Wears the National Railroad livery. Uses a series-parallel combination weak field resistance control system. Scrapped in 2004 and is no longer in operation. The oldest among the Line 1 trains. Quiet and usually lost in thought. Gender: Female.

Uses a resistance control system. Wears the Korail livery. Manufactured by Hyundai Precision. Completely disappeared and was scrapped in 2017. Quiet, but not excessively so; he does engage in conversation. He and his younger sister, New Resistance, tease each other constantly but are inseparable. Gender: Male.

Younger sister of Mid Resistance. Uses a resistance control system. Manufactured by Hyundai Precision, just like Mid Resistance. Completely scrapped at the end of 2020. Calm nature. Though she and her brother Mid Resistance tease and fight, they are inseparable. Gender: Female.

Uses a resistance control system. The epitome of 'senior abuse,' having operated for 37 years. Manufactured by Daewoo Heavy Industries (though some key components are from Hitachi, Japan). Scheduled to be scrapped between 2028 and 2029. Peaceful. Mostly talks with Flatty. Gender: Female.

Uses a GTO system (the stepped driving sound you know). Manufactured by Hyundai Rotem. Scheduled to be scrapped between 2027 and 2029. Fairly active, but not too noisy. Mostly talks with Refurbished Resistance. Gender: Male.

Flatty's junior. Uses a VVVF-IGBT driving system. Manufactured by Woojin Industrial Systems. Belongs to the Guro Rolling Stock Detachment. Active and sociable. Frequently talks to other Line 1 trains and has great social skills. Gender: Male.