This coloring page features a big, red train with a black locomotive engine at its head. The three cars behind the engine are painted in bright colors - the first car is yellow, the second car is green, and the last car is blue. The backdrop of the page consists of lush green trees and rolling hills. To color this picture, you could use a warm shade of red for the train and darker hues for the black engine and then add vibrant colors for the cars. You could use oranges, yellows and greens for the first car, a light blue or aqua for the second car and blues, violets and purples for the last car. Add details like windows and stripes to make the train come alive. The background can be filled with light green to create a sense of depth and depth, and you could use browns and dark greens for the trees. Finally, lighter hues of blue and orange for the rolling hills would finish off this colorful piece.