Western Trunk line (Chinese: 縱貫線; pinyin: Zòngguàn xiàn; Pe̍h-ōe-jī: Chhiòng-koàn sòaⁿ) is a railway line of the Taiwan Railways Administration in western Taiwan. 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.