What is the Difference between Conventional Propulsion vs. Pressure-Foil Propulsion?

Imagine two railroad tracks, track “A” (conventional track) and track “B” (pressure-foil track), running north and south. Both sets of tracks have one flatbed train car resting on them. The track rails and train wheels are frictionless. Each train car also has a wall erected in the middle of the train car running east and west. Two baseball pitchers are standing on the tracks throwing baseballs at both sides of the wall at a rate of one baseball every five seconds. These baseballs striking both sides of the erected wall keep the train car motionless on the track because their force effects are canceling. The goal for two groups of thinkers is to move the railroad car northward. The baseballs represent the millions of trillions of air molecules that strike the surface in a given time frame. The walls represent the reaction surface of any object that needs thrust applied to it. The pitchers represent the energy to move the air molecules. The conventional group decides that the only way to move the car north is to hire another pitcher. This new pitcher would also throw baseballs from south to north, thereby doubling the number of balls hitting the south face of the wall and thus overcoming the effect of the pitcher throwing from north to south, thus causing the car to move northward. (The extra hired pitcher symbolizes rockets, jets, or conventional propellers.) The pressure-foil group decides that if they hired a batter to stand on the railroad car, on the north side of the wall, to just slightly deflect (foul tip) away the balls thrown from the north to the south so that the balls just miss the wall, the car would begin to move northward. (The hired batter symbolizes the pressure foil method of generating force.) When using the pressure-foil method to move the railroad car, there is no need for another pitcher and no need to double the balls striking the southern face of the wall. In this way, we need less effort to move the car northward.