There is a good train connection between the cruise port of Katakolon and Olympia. Until 2011 many modern trains ran every day. At the time of our visit in July 2012 there were no more trains and we got very confusing information.
Because of the economic crisis, the connections are temporarily stopped. On the official website of the Greek Railways no more timetable for this connection can be found. On the website of Katakolon is said that the train is back, but this update is from July 2011.
A ShoreBee cruisefan who visited Katakolon in November 2012 confirmed that there are no trains.
How do I get to the train station from the cruise port of Katakolon?
Katakolon train is 400 meters walk from the cruise port. If you leave the pier, walk to the right along the marina or the main street. At the end of the large parking lot you will see the train station.