I love trains. China has an extensive train network that links almost all the major cities around the country, although sometimes it can be difficult to get the ticket especially during bank holidays.
There are many scenic rountes in south and west China where density is relatively low compared to the east part of the country. West Hunan provence is famous for its landscape, the most famous being Zhangjiajie Wulingyuan national park. I took the K-train from Changsha to Zhangjiajie. Many bullet train routes have been built in recent years, yet there are only slower trains for more remote places in middle and west China. I chose the second class seat to go to Zhangjiajie.