Is it possible to travel by train from Hong Kong to Hanoi? If so, any
idea how long this trip takes? Don't really want to have to stop in
China so I might fly from HK to Hanoi. I'm doing a multi-country trip
and don't want to have to deal with another currency and another visa.

So far I'm going to Japan, Hong Kong, Hanoi... then on to Europe

Thanks,
Doug