InterRail ticket. Can you use it everywhere?

Question

We are planning of buying a global pass interrail ticket for 22 days for our trip in May.

can you use it for london/paris underground?

If i am in central paris and want to go to eurodisney, do i have to pay for the extra train?

Answer 1

It is, to the best of my knowledge, not valid for use on the metro.

PS Its my personal opinion that the pass is not a worthwhile investment. It encourages you to run from one place to another which is a lousy way to see things. You spend more time traveling than you do seeing things.

Better to create a more limited itinerary of, for 22 days,  some three or four cities at the absolute most and see them in some depth. If you do so and plan things out you'll likely find that the rail costs do not justify buying the pass.