We're off to Thailand in August with our two DC (8 and 10) and will be doing a couple of overnight train trips (Bangkok-Surat Thani and back).
Having travelled by train in Thailand before (albeit pre-kids) I'm quite happy to book 2nd class a/c sleeper tickets but DW (who is a little more risk averse!) is worried she won't sleep because she'll be worried about the kids' safety. She wants to book 1st class cabins so we can lock the doors. (A point I should probably mention here is that I'm a woman too and part of her concern is that we won't have a man with us which, in her eyes, might otherwise deter anyone dodgy).
I do get her point but (apart from the extra cost) I do think part of the magic of the trip will be lost if we hole ourselves up in a cabin. Does anyone have any experience of recent overnight train travel in Thailand and how safe you'd feel travelling 2nd class with children?