Germans have a reputation they certainly don't live up to anymore. Especially when it comes to the German railway company. They still hold the monopoly on public railway transportation in Germany so they have been charging a whole lot of money for mediocre passenger service for years. Until a couple of years ago, it was prohibited for bus companies to offer service from one major city in Germany to another in order to protect the railway company from unwanted competition. This law was just approved and kept intact for such a long time because the former CEO of the company had huuuuuuuge political influence. Anyway, since a couple of years there have been more and more bus services popping up, offering really cheap transport across the country for really cheap prices. The buses offer free internet connection and cheap food and drinks. That's something you can only dream about on German trains which charge you more than double to get - for example - from Frankfurt to Berlin (about 350 miles). Due to the traffic conditions you obviously take longer to arrive but the amenities they have on offer really make up for that.
International bus services have been existing for years and whenever I can't get a cheap flight, I travel by bus anyway. So having the possibility to travel by bus in Germany is really good for me.
In my dear Balkans the bus is the only way to get around anyway... but their buses are still a whole lot more convenient than the German ones... but nothing beats the Argentinian ones in my opinion. I have no clue about bus services in the US. When I was over there, I frequently saw Greyhound buses and so on but I never got the chance to travel with them. I didn't have to anyway because I always had a car at my disposal and nothing beats having the chance to stop wherever you want to take a break, enjoy the scenery, etc.
Japanese trains are amazing. They are the best way to get around anyway because on the highways they drive so damn slow.
Speaking of train travel, one of my dreams is still a trip on the Trans-Siberian railway from Moscow to Beijing (via Mongolia). I bought the travel guide many years ago but I still haven't had the opportunity to do it. I doubt I have enough money to enjoy it the best way possible. 
Trans-Siberian trip by train from Moscow to Beijing via Mongolia would be a dream trip indeed. so much breath taking landscape and also a chance to experience various cultures.
an individual can grow a lot on a trip like that one. it is a also a process of self discovery.