The "B-B-B Wheel Arrangement" refers to a specific configuration of wheels on a locomotive or train car. In this arrangement, there are three sets of driving wheels, each set having two wheels. This design is often used in diesel and electric locomotives, providing good traction and stability while allowing for efficient power transfer. The B-B-B arrangement is part of a broader classification system for locomotives, which includes various wheel configurations like A-A, B-B, and C-C. Each configuration serves different operational needs, with the B-B-B setup being particularly effective for freight and passenger services in various rail systems.