A propulsion arrangement for a body movable along a track defining a direction of motion is disclosed. The arrangement includes a winding carrier assembly which coacts with a ferromagnetic return to develop a propulsion force for moving the body. The carrier assembly has two stacks of laminations carrying windings for developing a travelling wave; these windings are displaced with respect to each other by one pole pitch. The ferromagnetic return includes bars arranged transversely to the direction of motion. The arrangement of the bars constitutes a substantial simplification of the magnetic return and enables a simplified track switch layout to be obtained.