Taichung's MRT opened in April 2021 with a single Green Line stretching over 16km. It doesn't go through the city centre or its main railway station, but runs along a ring around it, ending at the high-speed train station instead. Hence, it's pretty much useless to tourists.
Each train comprises of 2 carriages and runs automatically. While there is no driver, a staff accompanies each train while it is in service.