Assembly made of a railway axle and a motor assembly, the railway axle comprising: - at least one axle comprising at least one driving wheel configured for abutting at least on a railway rail, said axle together with said driving wheel being configured for rotating around an axis, - a main wheel fixed to the axle and adapted to rotate with this latter around the same axis, the motor assembly comprising: - a first actuating wheel constrained to the axle and configured for rotating with respect to this latter around the axis, said first actuating wheel exhibiting an outer coupling surface actuatable by a first motor configured for putting in rotation said first actuating wheel, - at least one connecting wheel attached to the first actuating wheel and configured for cooperating with the main wheel for enabling to rotate the axle around the axis, said connecting wheel being configured for rotating at least around the main wheel, - a second actuating wheel, distinct from the first actuating wheel, constrained to the axle and configured for rotating with respect to this latter around the axis, the second actuating wheel exhibiting an outer coupling surface actuatable by a second motor configured for putting in rotation said second actuating wheel, - at least one coupling portion fixed and integral with the second actuating wheel, placed at least partially around the connecting wheel, and which exhibits an inner coupling surface engaged with the connecting wheel so that this latter is interposed between the main wheel and said inner coupling surface, wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are geared wheels, or wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are friction wheels. - at least one axle comprising at least one driving wheel configured for abutting at least on a railway rail, said axle together with said driving wheel being configured for rotating around an axis, - a main wheel fixed to the axle and adapted to rotate with this latter around the same axis, the motor assembly comprising: - a first actuating wheel constrained to the axle and configured for rotating with respect to this latter around the axis, said first actuating wheel exhibiting an outer coupling surface actuatable by a first motor configured for putting in rotation said first actuating wheel, - at least one connecting wheel attached to the first actuating wheel and configured for cooperating with the main wheel for enabling to rotate the axle around the axis, said connecting wheel being configured for rotating at least around the main wheel, - a second actuating wheel, distinct from the first actuating wheel, constrained to the axle and configured for rotating with respect to this latter around the axis, the second actuating wheel exhibiting an outer coupling surface actuatable by a second motor configured for putting in rotation said second actuating wheel, - at least one coupling portion fixed and integral with the second actuating wheel, placed at least partially around the connecting wheel, and which exhibits an inner coupling surface engaged with the connecting wheel so that this latter is interposed between the main wheel and said inner coupling surface, wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are geared wheels, or wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are friction wheels. - a first actuating wheel constrained to the axle and configured for rotating with respect to this latter around the axis, said first actuating wheel exhibiting an outer coupling surface actuatable by a first motor configured for putting in rotation said first actuating wheel, - at least one connecting wheel attached to the first actuating wheel and configured for cooperating with the main wheel for enabling to rotate the axle around the axis, said connecting wheel being configured for rotating at least around the main wheel, - a second actuating wheel, distinct from the first actuating wheel, constrained to the axle and configured for rotating with respect to this latter around the axis, the second actuating wheel exhibiting an outer coupling surface actuatable by a second motor configured for putting in rotation said second actuating wheel, - at least one coupling portion fixed and integral with the second actuating wheel, placed at least partially around the connecting wheel, and which exhibits an inner coupling surface engaged with the connecting wheel so that this latter is interposed between the main wheel and said inner coupling surface, wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are geared wheels, or wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are friction wheels. wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are geared wheels, or wherein the main wheel, the first actuating wheel, the second actuating wheel and the connecting wheel are friction wheels.