if i gave them an order to couple up a full line of maybe ten coaches, i wouldn't take it for granted that they'd done it, i'd walk up the coach, one walk up one side, down the other side and i wouldn't if there were a heating valve not open, if they forgot that you see, i wouldn't do it for them, i would go back and i'd say, that s k third from the back end, the heating valve is not pulled down, you've missed it, you'd better when you're up that way, just pull it down you see.