hula hoop is a toy hoop, usually made of plastic, that is twirled around the waist, limbs, or neck.
History ...
Hoop
A crane loop used to pass orders up to a moving train; the fireman puts his arm through the large hoop.
Hopper Car ...
Hoop
A loop-type device used to pass orders up to a moving train.
Horsepower ...
The "horn" of a real horn-hoop coupler
Here is the receiving coupler for the horn hook.
Another view of the horn-hook coupler ...
JUGGLING THE CIRCLE"Missing a train-order hoop
JUICE"Electricity. Juice fan is one who makes a hobby out of electric railways (juice lines)
JUNK PILE"Old worn-out locomotive that is still in service.
Now the order is complete and the operators will go and hoop the orders to the crews. One to each engine, one to each conductor, and one copy for each operator. There is also a copy in the order book maintained by the dispatcher.
 See also: Siding, Track, Engine, Rail, Train
  
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