[2] Following the 1961 coup, the Supreme Council for National Reconstruction started South Korea's first five-year plan, which included a construction program to complete the railway network, to foster economic growth.

[3] Another project under the five-year plan was a 41.6 km (25.8 mi) railway between Yemi on the Hambaek Line and Jeongseon.

[3] A 1,147 m (3,763 ft) long track section on the climb after Yemi is the steepest on South Korea's network at 30.3‰.

[6] The first trial run under the new voltage system in South Korea was conducted with a Class 8000 electric locomotive on the Jeongsan–Gohan section, then called the Gohan Line, on June 9, 1972.

[7] At the same time, the Taebaek Triangle Line, a 0.8 km (0.50 mi) connection built for trains from Jecheon to Donghae to run without reversal at Baeksan, was also put in service.

[7] In September 2006, the construction of a 14.3km double-track railway between Jecheon and Ipseok-ri began to cope with the increasing amount of cement transport.

The Jecheon–Mindungsan section is also served by two pairs of daily trains running between Jecheon and Auraji on the Jeongseon Line.

[10] In 1998, Korean National Railroad (today Korail) introduced special tourist trains operating in the winter months, identified by a snowflake decoration, which enjoyed great popularity.

[12] According to Korail's plans in 2009, travel times on the Taebaek Line are to be reduced after 2013 with the future series version of the Tilting Train Express.

July 22, 2014, two passenger trains collided head-on between Taebaek and Mungok stations, killing one person and injuring 92 others.