This seems an appropriate thread for tacking on a related question.

We wre traveling from Cusco to Puno this weekend, and have purchased tickets online. We are taking an early morning flight from Lima to Cusco (yeah, I know it's risky). If things go according to plan, we should arrive at the train station about half an hour before departure time. Thit T&C's indicate that tickets should be picked up an hour before. Will they really hold us to that, or will they do the exchange at the Cusco train station?

Cheers.