It's a complicated issue, but here we go: Under normal circumstances - that is, if no special security measures are in place - there definitely is no immigration control when you travel between Schengen-countries. You WILL however, have to go through immigration if travelling into or out of the Schengen countries, even if into or out of other EU countries, such as the UK and most eastern European countries. It doesn't matter, what kind of transportation you use. If you do go through immigration, e.g. coming from the UK, they will normally refuse to stamp your passport, if you are holding a passport of an EU-country. Some countries, however, seem to not mind stamping your passport by request - it's up to the discretion of the involved immigration officer. In NL, UK and F, I have been stamped and been refused a stamp on a German passport. Finnland and Estonia seem to be liberal on stamping EU passports, with Estonia already using the Schengen style stamp, though not yet having ratified the treaty, fully. As of JAN 1st 2008 most EU-countries will be Schengen-countries, and even Switzerland is bound to ratify the treaty. Norway and Iceland are Schengen-countries as well, even though they both aren't in the EU, so you have to know your red-tape!