So I built the intersection (block corner) for a 2-lane/1-way system. Dunno if it would be better throughput, but it would sure as hell take up less real estate than the 4L/2-way system. About a ...

Set a requester chest in loading position next to the mall output station. Use a filtered inserter/miniloader toward the train. Connect the chest to the inserter/miniloader, change to "set filter" and ...