Planning to travel by train from Guangxi to Vietnam, then into Thailand, and finally through Laos to Yunnan and return to China. Are there any fellow travelers who have walked this route and can guide me?

Route: Hanoi - Hue - Hoi An - Nha Trang - Da Lat - Mui Ne - Ho Chi Minh - Phnom Penh - Siem Reap - Pattaya - Bangkok - Chiang Mai - Vientiane (Luang Prabang) - Wanyun - Luang Prabang - Xishuangbanna - Kunming

Route: Hanoi - Hue - Hoi An - Nha Trang - Da Lat - Mui Ne - Ho Chi Minh - Phnom Penh - Siem Reap - Pattaya - Bangkok - Chiang Mai - Vientiane (Luang Prabang) - Wanrong - Luang Prabang - Xishuangbanna - Kunming