A material conveying wagon assembly of at least two material conveying wagons (1, 2, 3) functionally coupled to one another, wherein a first material conveying wagon of the material conveying wagon assembly is a material conveying wagon, which has - a roof conveying means, which is shortened with respect to a wagon length and which leaves free a roof portion at one end of the first material conveying wagon and which can be operated for loading in a first conveying direction towards the free end, and - a bottom conveying means, which can be operated for loading in a second direction, which is opposite to the first conveying direction, and - a transfer conveying means assigned to the bottom conveying means in the second conveying direction, and - an intermediate wagon conveying means, which can be operated for loading in the first conveying direction, for the functional coupling with a second material conveying wagon (1, 3), which is assigned to the shortened roof conveying means of the material conveying wagon and which extends from below an ejection end of the shortened roof conveying means beyond the free end of the material conveying wagon, and wherein the material conveying wagon assembly has at least one second material conveying wagon (1, 3) comprising at least one bottom conveying means and at least one transfer conveying means assigned to the bottom conveying means, wherein the second material conveying wagon (1, 3) is coupled to the first material conveying wagon on its with regard to the shortened roof conveyor belt free end, wherein the second material conveying wagon (1, 3) is a material conveying wagon without roof conveying means, and the bottom conveying means and the assigned transfer conveying means have a conveying direction for loading, which is opposite to the second conveying direction of the bottom conveying means of the first material conveying wagon, and wherein the ejection end of the intermediate wagon conveying means of the first material conveying wagon can be positioned above the bottom conveying means of the coupled second material conveying wagon. wherein a first material conveying wagon of the material conveying wagon assembly is a material conveying wagon, which has - a roof conveying means, which is shortened with respect to a wagon length and which leaves free a roof portion at one end of the first material conveying wagon and which can be operated for loading in a first conveying direction towards the free end, and - a bottom conveying means, which can be operated for loading in a second direction, which is opposite to the first conveying direction, and - a transfer conveying means assigned to the bottom conveying means in the second conveying direction, and - an intermediate wagon conveying means, which can be operated for loading in the first conveying direction, for the functional coupling with a second material conveying wagon (1, 3), - a roof conveying means, which is shortened with respect to a wagon length and which leaves free a roof portion at one end of the first material conveying wagon and which can be operated for loading in a first conveying direction towards the free end, and - a bottom conveying means, which can be operated for loading in a second direction, which is opposite to the first conveying direction, and - a transfer conveying means assigned to the bottom conveying means in the second conveying direction, and - an intermediate wagon conveying means, which can be operated for loading in the first conveying direction, for the functional coupling with a second material conveying wagon (1, 3), which is assigned to the shortened roof conveying means of the material conveying wagon and which extends from below an ejection end of the shortened roof conveying means beyond the free end of the material conveying wagon, and wherein the material conveying wagon assembly has at least one second material conveying wagon (1, 3) comprising at least one bottom conveying means and at least one transfer conveying means assigned to the bottom conveying means, wherein the second material conveying wagon (1, 3) is coupled to the first material conveying wagon on its with regard to the shortened roof conveyor belt free end, wherein the second material conveying wagon (1, 3) is a material conveying wagon without roof conveying means, and the bottom conveying means and the assigned transfer conveying means have a conveying direction for loading, which is opposite to the second conveying direction of the bottom conveying means of the first material conveying wagon, and wherein the ejection end of the intermediate wagon conveying means of the first material conveying wagon can be positioned above the bottom conveying means of the coupled second material conveying wagon.