I took a trip to Tainan a few weeks ago via the HSR (high speed rail). I was apprehensive about this because I'd never used it on my own before and don't speak Chinese. I had nothing to worry about though as the process was very simple. I drove my car to the HSR and parked it in a 24-hour lot. The lot transported me to the station via a van and dropped me off. From there, it was easy. All signs/notices were in English as well as Chinese and these allowed me to find everything I needed. Various announcements guided me to the proper waiting area and updated me on departure information. While sitting on the platform, I took these pictures of an arriving train and Taichung.
I returned to Taichung in the evening after touring Tainan all day. Another van was waiting to take me back to the parking lot where I paid the equivalent of three dollars for about 12 hours of parking. I then drove home.
Actual Tainan pictures will be posted in a few days.