I am visiting ALishan end of March. Would like to know get up to ALISHAN railway station from THSR Chiayi station?
I saw in a website that I can take BRT (Bus Rapid Transit) bus to TRA Chiayi Back station and transfer to Alishan railway station by taking chiayi bus.
Appreciate if anyone can provide me more details on the BRT bus and chiayi bus? Can I book it online?

Thanks.