Link to How to travel by train
Plan A: JB-KL-Penang-BKK-Siem Reap - Phnom Penh - Hanoi floods in Cambodia...
Plan B: JB-KL-Penang-BKK- Hanoi
If Bangkok flood is serious...
Plan C: JB-KL-Penang - Hanoi
If Hanoi is also flooding seriously...
Plan D: JB - KL - Penang - KL - Taipei