What cities in Taiwan have subways?

They are Taipei, New Taipei, Kaohsiung and Taoyuan. Taipei is the capital and largest city of Taiwan, with a population of over 2.7 million. Taiwan's political, economic, educational and cultural center is home to many world-renowned universities and research institutions.

New Taipei City is a neighboring city to Taipei City and the most populous city in Taiwan, with a population of more than 3.9 million. It was restructured from Taipei County in 2010 and has become the most populous city in Taiwan.

Kaohsiung is the second largest city in Taiwan, with a population of more than 2.7 million when it was merged and "upgraded". Located in southwest Taiwan, it is Taiwan's largest port city and the base of Taiwan's heavy industry.

Taoyuan City is an emerging city in Taiwan, located southwest of New Taipei City, adjacent to New Taipei City, Hsinchu County, and Yilan County. Taoyuan City covers an area of ??1,220.954 square kilometers and is divided into 13 municipal districts. Taoyuan City is Taiwan's aviation hub, and Taoyuan International Airport is located here.