The train is the main mean of transportation across Germany. And this means that the trains and train stations look very nice and the system is almost similar to the one in airports. This means you can have optimal routes chosen, to change a train is like in an airport (just go to a different line) and everything is accessible through the Deutsche Bahn website. The website is (http://www.bahn.de) is very well organized and you can choose many options regarding your trip.
I noticed some things, though. In the train stations you have to pay for the toilets. And the money you pay ranges from 50 cents to 1,10 euro (in Koln train station). Even the McDonalds restaurants inside the train stations have a sign that you should use the train station toilet. They do not offer one. I think it is a mentality thing. You pay for everything, but in the end you get a decent service. I noticed this with the internet, also. There are many hotels where you have to pay a lot of money yo get Internet access. For example, in US or Canada it's almost impossible to not have free Internet access in a hotel. Different mentality.
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