West Coast Line or Main Line (Chinese: 縱貫線; pinyin: Zòngguàn xiàn; Pe̍h-ōe-jī: Chhiòng-koàn sòaⁿ) is a railway line of the Taiwan Railway Administration running along Taiwan's densely populated western corridor. As a result, it is by far the busiest line, having served over 171 million passengers in 2016. The total length of the line is 404.5 km.
The coastal section between Zhunan and Changhua is known as Coastal Line (海線) and is 90.2 km long. It was built after Taichung Line, which is also known as Mountain Line (山線). Many express services take the Taichung route. Train schedules and departure boards mark either "山線" or "海線" to indicate the route taken. Despite being inconsistently less advanced than other sections and Taichung Line, the Coastal Line is classified as part of the main line while Taichung Line is considered a separate line.
The original railroad between Keelung and Twatutia was completed in 1891. The section between Twatutia and Hsinchu was finished in 1893. However, these sections were all rebuilt at the beginning of the 20th century during Japanese rule. The northern and southern sections and the Taichung Line were completed in 1908. The Coastal Line, finished in 1922, was used to relieve congestion near Taichung.
|West Coast line|
|Station Name||Transfers and Notes||Location|
|Badu||八堵||→ Yilan Line||Nuannuan|
|Taipei||臺北|| Taipei Main
200 m: Taipei Main
Banqiao (under construction)
|Zhongli||Jhongli||中壢||Zhongli (under construction)|
|North Hsinchu||北新竹||→ Neiwan Line||East||Hsinchu|
|Hsinchu||新竹||→ Neiwan Line|
|Zhunan||Jhunan||竹南||→ Taichung Line|
|Zhuifen||Jhueifen||追分||→ Taichung Line (branch line)|
|Changhua||彰化||→ Taichung Line||Changhua||Changhua
|Ershui||Ershuei||二水||→ Jiji Line||Ershui|
|Chiayi||嘉義||Alishan Forest Railway||West|
|Zhongzhou||Jhongjhou||中洲||→ Shalun Line|
|Xinzuoying||New Zuoying||新左營|| Zuoying
|Kaohsiung||高雄||→ Pingtung Line