Robot Trains (2015)

S1E16 The Festival Day

Kay and Alf each gather eleven cargos after assisting various trains. As they approach the final stretch of the race at Kay's Base, a fierce competition ensues between them to claim each other's cargos. However, in a surprising turn of events, they inadvertently transfer all their cargos to Duck, who happens to be leisurely walking at the base of the hill. The principle of inertia unexpectedly plays in Duck's favor, leading to a delightful twist in the competition.