The compact design with multiple conductors in a common insulation housing safe space, reduce installation time and offer a high stiffness in comparison with single pole rails. The main advantage are the fast and mostly self explaining installation.
Enclosed rails simplify the energy supply for the long travel distances. The enclosed rail protects the conductor from dust and the conductive parts are protected from accidental contact in industrial applications.
Energy supply systems on square rail (diamond track) are predominately used on circular and curved tracks or in very dusty environments (e.g. in silo works).