One of the major reasons was to try out Taiwan's high speed rail line which opened in 2007 and to see how it compared to Japan's Shinkansen. Unfortunately, at the time, Taiwan High Speed Rail did not offer a rail pass for tourists like Japan and other European countries, but luckily the ticket prices were not so expensive, compared to say, that of Japan's.
Also we wanted to see how other cities in Taiwan looked like outside of its capital of Taipei. Since our hotel booked for the week was in Taipei, we had to pick some destinations which would work for a day trip. From the guidebooks it seemed like Taichung and Kaohsiung would be interesting places to visit...
The high speed trains of Taiwan with the distinctive orange stripe. What is interesting is that the only other places that uses Japanese Shinkansen trains for high speed rail are Taiwan and China, with Taiwan using the newer model while China uses the slightly older one. The trains that Taiwan uses are actually a derivative of the trains that run on the Tokaido Shinkansen line in Japan.
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