Seeing ghosts?

When I was very young one day I was playing in the backyard and I looked up at the hill behind my house and saw a young girl dressed in white with black hair and I heard a train. There are no trains by where I live. The train was heading towards her and passed through her and I looked away then I looked back and she was standing there again looking at me with white eyes. I ran inside and asked my mom if she heard a train and she told me no.