Upon removing a cargo wagon with all filtered iron slots from a train, the game spits out this notice:
Error while running event on_tick (ID 0)
LuaTrain API call when LuaTrain was invalid.
stack traceback:
TrainsReader/libs/eventsHandler.lua:64: in function 'OnTicksetTrainCircuitNetwork'
TrainsReader/control.lua:35: in function <TrainsReader/control.lua:34>