Should I go investigate China's new high-speed trains? I am curious to see if the system is as extensive as it looks on the map. I have never heard of anyone actually taking some of them. Even if the system is not as extensive as it looks, I will get to go to Wuhan by high-speed train, and Wuhan is awesome.
Should I take the train from Singapore to Thailand, investigating Malaysia's rail system on the way? I might actually be able to take the train into Cambodia, although that may still be a freight-only line.
Should I investigate Vietnam's railways? At least one new intercity rail line has opened in the last year along with some new commuter track in the major cities. Vietnam may have a lot more possibilities in a couple of years, though.
How about Siberia? I have heard that winter is the best time to go.
Any ideas are welcome. What would you like to read about?