Dumb Bell
Model layout arrangement consisting of two reversing loops connected together. Also known as" Dog Bone".
Dummy ...
Also known as" Dumb Bell".
Double - To take a train up a hill one half at a time.
Double-header - A train pulled by two locomotives.
Double heading - Using two locomotives at the head of the train.
An elongated oval or lap with the tracks at the sides pressed together somewhat in the manner of a double-track. Model railroad arrangement consisting of two reversing loops connected together. Also known as" Dumb Bell".
 See also: Roundhouse, Passenger car, Reversing, Freight car, Right-of-Way
  
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