This is a photo that I will be putting on another topic
     but I thought it might be of interest to those who have been
      following this one. It's a representation of a wagon or "tub".
      It's probably not historically accurate  but near enough to show
      what the children would be pulling  or pushing. That is, if they were
      fortunate enough to have tubs with wheels and tracks.  The size would
      vary depending on the height of the tunnel through which the coal would
     
    be transported.  In this case we will imagine the height to be approximately
      3 feet.  The child would wear a stout leather belt and a chain would be 
     attached to the front . The chain would pass between the legs and be
      fastened to the coupling at the front of the tub. The child would then
  
     lean forward, and again depending an the conditions, pull the load often
      on all fours.   Another child would push from the back, often using his head
       which quite frequently would become swollen from the pressure. They
      could often be identified by the bald spot that would form in that area of
      the scalp.  This was more often than not, done in total darkness. A child
      would consider themselves very lucky if someone had greased the axles 
 making the task a little easier.   The tubs would be filled as much as possible
   because the wages were dependant on the amount of coal moved.
          Tomkin