Originally Posted by Leviticus

You are very welcome ! To see the schedule for a specific train, just click on the train number on the right side of the search result screen after the result show up.

And I will tell you what as well...
Forget about Warsaw, you can see everything there in a day and a half, try to explore Krakow instead, it is a lot nicer city, walkable, and lots to see and do, you could entertain your self for weeks there.
So... if you "just have a weekend", stay in Krakow, if you on the other hand have a week to spare, you could take a two day trip to Warsaw.