As a student in the 1970s I worked in a cemetery with a crematorium attached.  On a Friday, I asked to go to the crematorium to see how it worked.  I was in the basement and saw the lift which brings down the coffin where it is then pushed across the floor to one of two ovens.  The light flashed; the man pushed the button and a coffin slowly descended. It was a white tiny baby coffin. The man said, “Not worth burning this on a Friday afternoon. We will burn it on Monday with an adult coffin.”