On my visit to Europe this month I decided to use trains whenever possible. Here's what I learned. I took the following trains in Germany (Deutsche Bahn) and Poland (PKP): Hamburg to Flensburg. Berlin to Hamburg. Hamburg to Poznan. Poznan to Warsaw. All up, I probably spent about 20 hours on trains over the past few weeks, so I feel I've had enough experience to form some opinions — although I'm certainly not an expert. Good things about train travel • Trains are comfy and easy to use your laptop on ...