Warsaw Central Station

My first train experience on Poland. Took the train to Poznan to be picked up by contractor. Nobody there. Anna called us and said we should have gone to Lezno. Managed to get a ticket on time for the next train. Going back hopped a train to Poznan from Lezno too late to transfer tickets, we sat in someone elses seat got up and found 2 empty seats. Ticket lady said the tickets were no good because the previous conductor had validated the tickets too soon. I guess we looked like a foreigners so she let us go onto Warsaw. Can't wait for the next train excursion.