Auxiliary bogies (also called “dummy” bogies) have capacities from 10 to 25 tons and consist of a main steel structure on 4 wheels with a central support for the coach. They can be operated manually or motorized. The support interface can be with fixed height or adjustable height. Auxiliary bogies can also be supplied with adjustable suspension systems to ensure the overcoming of obstacles without stability problems for the coach. It is always possible to design different machines to meet the needs of each customer.