It still exists:
https://www.interrail.eu/You don't have to be younger than 26 to buy one, not anymore, but it is cheaper if you are. If you are a EU citizen, it gets you free, unlimited travel by train in most European countries. If you are not a EU citizen, there is the Eurail pass that is similar.
But that's the theory. In practice there are important limitations:
- You can't use it in your home country, except for a single round trip: in and out.
- If you make a reservation, you will have to pay reservation fees, and many long-distance and high-speed trains only have reserved seats.
- Not all seats are available to pass owners, if you want to travel in these seats, you will have to pay full price.
And considering that the pass itself is not that cheap, you really have some planning to do to see if it is worth it. In many cases, it isn't.
You don't have to be younger than 26 to buy one, not anymore, but it is cheaper if you are. If you are a EU citizen, it gets you free, unlimited travel by train in most European countries. If you are not a EU citizen, there is the Eurail pass that is similar.
But that's the theory. In practice there are important limitations:
- You can't use it in your home country, except for a single round trip: in and out.
- If you make a reservation, you will have to pay reservation fees, and many long-distance and high-speed trains only have reserved seats.
- Not all seats are available to pass owners, if you want to travel in these seats, you will have to pay full price.
And considering that the pass itself is not that cheap, you really have some planning to do to see if it is worth it. In many cases, it isn't.