The experience is pretty good and unique. We started the ride at 11AM, when the train started to go down to the lower station. On the way, we passed by the famous zigzags and could enjoy the view. Once at the bottom, we stayed around one hour to visit a tiny museum and see some local dances, before heading back in the train, to arrive at 13:30PM.
Overall, we thought that was a bit overrated. The views are nice but not crazy high. The interesting thing is the train path itself, but if you're not super into train, you won't enjoy it that much.