Those Magnificent Men in Their Flying Machines - Nuclear Power in the 1920's?
In the scene where they landed a plane on a train (hey that rhymes), they pull back and in the background you see the cooling tower of a nuclear power plant.
Actualy, I watched that movie last night and there's more then one cooling tower. In fact, you get to see prety much the whole plant (its off in the distance). Also, to make matters worse, its in like three shots during that scene.