Results of the Rest of a Locomotive on Sunday

Years ago, I read about a railroad that conducted an experiment. It purchased two new locomotives. One was kept in constant service, regardless of Sunday. In the use of the other, late each Saturday they pulled its fire and released the steam. On Sunday it was allowed to cool down, thus retempering its metal. Then it was fired up again on Monday. Over the years they found that they had less maintenance and trouble with the latter than with the former. If rest one day each week was so beneficial to a piece of machinery, how much more does the fragile, delicate human body and spirit need it! (Encyclopedia of 15,000 Illustrations - 12510).