Yes i believe that he will be able to understand this.Suicide by train does
happen a lot and all train drivers are fully aware this can happen anytime.
Sadly it is part of the job dealing with incidents like this and not only in
Thailand.
Never buy a bike without the book,you will never own it and it will be taken from you by the police.
The bike does not even belong legally to the seller,all kinds of problems,
don't do it.
Many people buy a bike on payments,when they can not pay any longer some people just move so the money lender can not find them.
These bikes come up for sale but you will never own it.
The book is with the bank or money lenders.
I am not sure what they say tax can be renewed but either way i would stay clear of a bike like that.
When you get stopped it will be bye bye bike.
Look for a real deal.