Make a train out of large, empty appliance boxes. Paint them all different, bright colors, cut out doors and windows, and arrange them in the front yard. Make railroad signs from colored construction paper, and hang them around the party room. To go along with the cardboard train, draw tracks on your grass and driveway.; You can use spray paint on the grass, and sidewalk chalk on the driveway. If there are rooms that are off limits to your guests, make a railroad crossing sign out of cardboard to act as a barrier. Use any toy trains and accessories your child already owns as table toppers and centerpieces.
Make train shaped sugar cookies using your favorite sugar cookie recipe and a train shaped cookie cutter. Make railroad crossing cookies by cutting sugar cookie dough into long rectangles, cross them and bake. Once they're cool, decorate them to look like crossing signs. Make train cars out of fruit. Use melon cut into rectangles as the body of each car. Use a melon baller to make wheels, or use any round fruit, like grapes or blueberries. Use toothpicks to attach the wheels to the body. To make a simple train cake, bake a round cake. Using black gel frosting, make tracks around the outer edge of the cake, and place a toy train on the tracks.