Selection of Travel Pass

If you only need to travel from Rome to Switzerland, then from Switzerland to Paris, 2 ways only. You don't need to buy any pass as it will be much expensive than buy tickets separately.
If you want to buy a railpass, You should get a Eurail Select Pass, but it will be a bit expensive... It would be much better if you can indicate your detail trip planning, then we can calculate the cost.
If only 2 trips, then please buy it separately

2007-02-08 17:35:53 補充：
wow... you will travel 7 days in your 15 days travel... the you can consider to buy a Eurail select pass for 3 countries then.Eurostar bewteen Paris and London doesn't include in the railpass, you need to buy it separately. You can have special price if you have a Eurail pass

2007-02-08 17:36:03 補充：
I am wondering if you can see something in your tight schedule... and you will feel so tired if you need to get on the train everydayenjoy the trip

As your trip mainly covers Italy, Swiss and Paris, you should buy the eurail select pass (3 countries). and buy the single-journey ticket from Paris to London. Also, the cable car around Jungfrajoch area is not included in the pass.

More important, your schedule will toooo tight.Basically, you travel from one city to another every day. You will spend a lot of time on train, packing, check-in, etc. There will be not much time for sight seeing. Europe is a low-pace area and you can't enjoy and relax the trip with such tight schedule. Strongly suggest you to skip some cities.

I woul suggest you either skip Italy (south) or London (north). Spend more time in 2-3 countries, eg, at least one night at small cities and 2 nights at bigger cities.