"ERL" -  Return Conveyor
A steel structure  supports the rails where the chains run,   the space between the rains is filled with plywood boards.   The plates linking the rolls of the chain are off-centered,  so that in the bottom the rolls touch the rail,  on the upper side only the plates touch the material to be transported.      Four lines of chains are supplied,   the driving shaft drives the long chain and also the short inclined conveyor that moves the waste to side waste conveyor.