Airport Station - Interactive Train Set

I have to admit my score was a real bargain, I've seen another on offer with a slightly damaged box, but that is nearly twice the price. I've also seen an open/used one for around the price I paid so maybe I may invest in that rather than open mine, I'll have a look at the box first though as I do recall some battery symbols on the bottom so that should give me a hint as to what is needed for what