The Levitational Locomotive Relay is a block added by Thaumic Tinkerer. When two of these are placed in a straight line, any Levitational Locomotives will move back and forth between them.
You created a new contraption to move things back and forth. Two relays placed in a straight line will project a force beam between them. A visual effect will be shown if particles are enabled.
Place a Levitator inside that projected beam. The Levitator will be moved back and forth inside that beam, carrying the block on top of it.