In many countries, the train operators make wifi internet access and power source available on their carriages for travellers. But in Myanmar (Burma) it is different. Forget about the internet. If you carry a laptop, you may face a problem.
One of my facebook friends had to pay fine when he carried a laptop on Myanmar domestic rail.
One funny thing is the rail authority wrote down as "typewriter" in Burmese on the receipt instead of "laptop". Fine was 2100 Kyat (Myanmar currency)