Hi,
How to make question that in Russian is as simple as this
Где я могу купить билет на поезд Прага - Хеб ?
I know that билет на поезд = train ticket, but I have doubt, that
Where can I purchase ticket on train Praha - Cheb?
will do the trick...
The confusion is because sometimes in Europe you can't buy ticket at a train station, but should get it from conductor instead.