"mark" skrev i meddelandet
oups.com...
Regarding passport controls, there are none inside the Schengen area
(most of continental Europe, with the exception of Switzerland at the
moment - though that may have changed by the time you arrive).

As an American citizen, you don't need a visa to enter the EU, and you
can stay for up to 90 days. Obviously if you want to stay over 90 days
then I'd have thought you should probably enter the EU on your Irish
visa, though I'm not sure how that works out with border controls. (Can
you use an American passport to leave America, and then use an Irish
passport when you land in the EU???)

The Interrail (EU citizens only) pass is significantly cheaper than the
Eurail pass (non-EU citizens only), but obviously if you're not
resident in the EU then you can't get one.
You can only buy a Eurrail
pass with a non-EU passport,
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Sure you can buy Eurrail as a European citizen assuming you've been
permanently (for at least 6 months residing outside Europe)