Hello. From Taipei to Kaohsiung, you can take the Taiwan Railway or the High Speed Rail. Taipei's Taiwan Railway Station and the high-speed rail station are together, while Kaohsiung is separate (the high-speed rail station is more Zuoying). <br/><br/>The ticket price of Taiwan Railway is relatively low. The ticket price of "Juguang" is 617 Taiwan dollars, and the whole journey takes 6 to 7 hours; the ticket price of "Ziqiang" is 800 Taiwan dollars, and the whole journey takes about 5 hours. <br/><br/>The high-speed rail fare is relatively high, the full-price ticket for the Taipei-Zuoying (Kaohsiung) section is 1490 Taiwan dollars. However, if you buy early bird tickets with 35%, 20% or 10% off in advance, the ticket prices are NT$965, NT$1190, and NT$1340, and the whole journey only takes 2 hours. If you can grab a 65% off early bird ticket, this should be the most cost-effective way. <br/>If it can help you, please click to accept my answer, thank you.