Out of Scale is a 1951 American animated short film directed by Jack Hannah and produced by Walt Disney.
The short begins with a shot of a mighty steam locomotive barreling down the track, which is actually a miniature scale model, with Donald Duck conducting it around an intricate setup in his back yard.
In a display of tremendous strength, Donald picks up the full sized tree and carries it to a flatcar on the model train.
His initial anger towards them quickly gives way to enthusiasm when he sees that the chipmunks are, in fact, the perfect scale for the model house.
Satisfied with the explanation, Donald bids Chip and Dale a farewell, and rides his train through the tunnel as the chipmunks celebrate their victory.