this is a classic example of the difference between different size scrappers. each has to decide based on info what is best for him/her.
an SIS scraper who has to constantly be on the hunt for new scrap, maximises their income by breaking down every thing to the inth degree. while a scrapper with a steady supply, only needs to sort his /her inventory.
the yards who move box cars full need only to rough sort and really need to break nothing down.

so the answers we give need to be in corilation with the operation of the person asking the question.



on the question of motors, it also needs to be considered the cost of tearing down a 1200 lb motor as apposed to a 1/4 horse motor. just my .02