If you write back to whoever the book was bought from (or the game) within a quick amount of time and say it was bought in error, then they usually strip it from the kindle and give you the money back. Mark had to do it once, a friend was looking at the Kindle and accidently bought some books! They were really good about it.
Oh My!!! I didn't know our girl was interested in trains. I thought it would be princesses! :-) Love and hugs to all