✔ 最佳答案
1. England - France is the cheapest.
2. There are normal train beside Eurostar. Many travellers do not like Eurostar because it is expensive and nothing special. You can check the cost from the following web site. The cost is now Euro 60, but when it gets to Europe peak season - after August 10, at least 10 Euro more. Since you have not stated the date you are leaving, it is better for you to check the price directly.
http://www.eurostar.com/dynamic/index.jsp
For Student Travel Association, please check the following web site :
http://railtravel.hkst.com/#
The price difference really depends on your timing and routing.
3. For the countries you want to travel, seems that either France (Paris) or Germany (Frankfurt) is most convenient in time and expenses on air ticket fare.
4. Please look at the following web site (also Student Travel Association) but mainly on Eurail pass. The reason that you have to choose your self is because you did not state your plan on the stay on each country. As you know if you stay only for a short time in one country it is better use that country's public transportation (such as Metro in Paris).
http://railtravel.hkst.com/Eurail_Select_Pass.asp
Please note England is not included in normal Eurail Pass, you have to buy a separate Britrail England Pass if your stay in England is long enough.
5. Both Luzern and Interlaken are most beautiful city in Switzerland. Luzern has the scenery plus the convenience, while Interlaken is really a place to relax and enjoy the Swiss life. If you only stay 1 or 2 days, then Luzern may be better because you can still enjoy the cable car to Pilatus - a mountain lower than Jungfrau but still the scene is gorgeous. And you can still enjoy the lake cruise that it often seen on the TV.
6. No, actually it should be more expensive. I think the only reason for being lower in price is because of special discount.