Traveling from New Taipei to Tainan, the High-Speed Rail (HSR) is the preferred choice, specifically the Taiwan High-Speed Rail (THSR) service. This high-speed train boasts impressive speeds of up to 300 km/h (186 mph) and can cover the distance in approximately 1 hour and 30 minutes, making it a swift option for travelers. The THSR operates with limited stops, such as at Zhuoshui and Tainan, ensuring a fast connection between the two major cities.
An alternative option is the Taiwan Railway Administration's (TRA) express trains, which take around 3 to 4 hours, depending on the specific service. These trains generally operate at lower speeds, around 100 to 130 km/h (62 to 81 mph), and make more frequent stops along the way, allowing passengers to experience smaller towns and regional sights.
While both train services have their unique advantages, if your priority is speed, the THSR is clearly the optimal choice. However, travelers seeking a more leisurely journey with the opportunity to explore different landscapes may opt for the TRA express service.