I know from reading all the other threads that it is best to take a regional train to Civavecchia and I know I can get the train from San Pietro train station. My question is how do I know what train track to get the train on and how do I know which direction the train is going if there is no sign on the train. Is there only one stop in Civitavecchia? Is Civitaveccha the last stop on the F5 train route? Should I buy a round trip ticket to and from San Pietro train station for pre and post cruise or is it better to buy one way for each way. Thanks for your help.