17-Day Solo Train Trip from Chengdu to Hong Kong — Good Idea?

I’m planning a solo train trip from Chengdu to Hong Kong this September, over the course of 17 days.

My idea is to stop in a few places along the way (Guizhou, Guilin, maybe some smaller towns as well) because I’d like to experience more than just the big cities and see a different side of China.

Does this sound like a good plan? What should I expect as a solo traveler doing this route by train?

I’m also wondering about train costs — is it still affordable if I make multiple stops along the way instead of booking one long trip?

I’m especially interested in nature, local culture, food,...

Any advice, route suggestions, or tips are very welcome! 🙏