with [item=bulk-inserter], up to 1440 items/sec (6 stacked [item=turbo-transport-belt]) with [item=stack-inserter,quality=legendary], up to 1920 items/sec 3.1 sec to switch trains 20 stack. USE 1-4 INSTEAD 50 stack. 5.55, 4.16 sec per train. can do nonstop trains 100 stack. 11.11, 8.33 sec per train. 2.77 sec to load 200 stack. 22.22, 16.66 sec per train. 5.55 sec to load