From the Press Release:

Molly, Percy, James and Thomas need your help to build railway tracks from their sidings to the main line. Connect straight and curved tracks by matching colors on the spinner. Lastly, spin the spinner and chug your engine across the board, over a bridge and finally to the round house where Sir Topham Hatt awaits your arrival. Complete game rules included. For 2-4 players. Ages 4+.