Riding the World's Fastest Train @ 500 kph
Train quality varies across Europe. In the UK, it's pretty poor, with a recent increase in accidents linked to badly managed privatisation and a company called Railtrack who stopped investments in the basic maintenance required for a safe service. But then the trains here have been going downhill for a long time here generally, particularly in comparison to the rest of Europe.
All across continental Europe, you'd be right to compliment the trains. France, Italy, Switzerland, the Czech Republic and Slovakia have perfectly good systems in my experience (sorry about the random selection - I don't normally travel by train and there's a lot of Europe I haven't been to anyway), although Romania is a bit ropey.