@RichardBarrow 1. How do you get to Penang from Padang Besar, is it also by train? And how long it will take?
2. On the way back from Padang Besar to Hat Yai, if you miss the shuttle at 3.40 PM or its departure time delays, it is risky that you miss the 5.45 PM train from Hat Yai to BKK.