Guess the Meaning

Tonight after dinner Jaycob was playing with his trains near the television. One minute he was playing the next he was standing by the sliding glass door pointing at his trains saying, "Choo-Choo". We told him he could go play with his train and few other things, but he just stood there. He then said, "Choo- Choo" pointing at his train over in the corner and "Shoe Mama" pointing at his shoe. Ok so.... What his train ran over his shoe? His shoe got in the way of his train? (yes he refers to his shoes while on his feet as a third party!) But he continued to just stand there and told us, "No!" to all of guesses as to what he was talking about.

Guess what he was trying to tell us.....