It is possible to drive a train on air pressure. The principle dates from the 19th century and was in fact in operation in Britain and elsewhere. Today working examples run in Brasil and Indonesia under the name Aeromovel. It should be noted that air pressure or vacuum can be produced efficiently with wind turbines.
owards the end of the twentieth century the Aeromovel Corporation of Brazil developed an automated people mover that is atmospherically powered. Lightweight trains ride on rails mounted on an elevated hollow concrete box girder that forms the air duct. Each car is attached to a square plate—the piston—within the duct, connected by a mast running through a longitudinal slot that is sealed with rubber flaps. Stationary electric air pumps are located along the line to either blow air into the duct to create positive pressure or to exhaust air from the duct to create a partial vacuum. The pressure differential acting on the piston plate causes the vehicle to move.
[wikipedia.org] – Atmospheric Railway