This is an easy question to answer. The reason, quite simply, is Americans love their cars. The automobile gives its driver a sense of freedom and independence. In America, we take that freedom for granted at the cost of our environment. For Europeans however, this freedom has some excessive costs.
Roads are small and overcrowded, fuel costs are sky-high.
Skeptics of high speed rail can list all sorts of disadvantages. In summation, High Speed Rail is a safe, clean, and reliable form of transportation. This mode of transport is perfectly suited to the full integration of the European Union. Since there are so many countries located in close proximity on the European continent, HSR is a quick, clean, and easy way to get from country to country. For the full integration of the EU, full cooperation is required.