Hi Sarah,

For the interrail itself - you won’t need one since it is already paid for.

Some hotels and car hire may require a credit card and not accept a debit card, but this is a forum about rail travel, so that’s outside the scope.  If you are just traveling from city to city enjoying the sights and staying in normal accommodation you shouldn’t need a credit card.

Thanks, this helped a lot! I will remember that this is a forum about rail travel next time! :)

There’s a few times a credit card will be useful.

1. Most car rental companies will want a credit card, not a debit card, for the deposit
2. Same with some big hotels, they take a deposit, or ‘hold’ for your bill. But this is not common in cheap accommodation 
3. In case of emergency - you need to buy a flight or hotel etc and you’ve run out of money
4. A spare card - credit or debit - is always a good idea, in case yours gets lost, stolen, or blocked by the bank.