Robot Chicken Takes On Dinosaur Train

When my kid was a preschooler he liked to watch this show.  It wasn’t nearly as bad as many other preK shows, but I was always wondering if those stupid dinosaurs had time traveled or killed off the humans that made the steam engine and laid the railroad?  And what was the deal with the baby T-Rex?  Was he kidnapped?  Adopted?  Or was his mom a whore?  Finally, Robot Chicken answers all my questions.