Materials handling cart

A system for transporting objects, the system comprising:

• a cart, the cart comprising:
• a chassis portion supporting a payload to be moved by the cart, characterized in that, the chassis portion comprises of:
• a first side rail;
• and
• a second side rail;
• a first front wheel and a first rear wheel attached to the first side rail;
• a second front wheel and a second rear wheel attached to the second rail;
• a handle portion pushing the cart, characterized in that, the handle portion comprises of:
• a handle bar supported by one or more vertical support members;
• and
• a brake actuator engaging and releasing the brakes on the rear wheel;
• a horizontal engagement bar;
• a payload-bearing surface bearing payload such that the payload can be transported by the cart;
• and
• a self-driving vehicle for engaging with and transporting the cart such that, when the self-driving vehicle is transporting the cart, the first and second front wheels are engaged on a ground surface and the first and second rear wheels are not engaged on the ground surface.