Budget travel · China

Hi there, For our upcoming trip to China, we're planning to get around by bus and train. For trains, we found a few sites, including: https://www.travelchinaguide.com/?srsltid=AfmBOoqfiOqfmBSYlDwjPCXo4nkF7uF3ILYs_o3wlLu9uBy7gC7iN-2C, and for buses: https://www.chinabusguide.com/ but the latter site isn’t very complete. Have any of you tried other sites? Thanks for your help! Alod