Is it cheaper to fly or train in Europe?

Related questions

1. When should I buy plane tickets to Europe?
2. When's the best time to buy international airline tickets?
3. Does it snow in Europe?
4. Are flights within Europe cheap?
5. Which is the most expensive country in Europe?
6. Is Japan expensive?
7. Which Scandinavian country is the cheapest?
8. What is the best time to visit Europe?
9. Why Flight tickets are so expensive?
10. What is the cheapest month to fly international?

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