Can i travel with oyster card from Russell Square To Eltham?

Answer 1

That depends what you have on your Oyster.
If you have a weekly travel card, then you can use it for the train.
If you only have Pay As You Go then you will have to pay for the train, or take the bus. You could get the Jubillee Line to North Greenwich and then a bus or two depending where you need to get to.

Answer 2

Are you sure you want to go to Eltham? It's full of Hoodies and pregnant teenagers.

Answer 3

I'm sure you can, I go 2 more stops to Welling and i've seen people with them