from The Century Dictionary and Cyclopedia

  • Having six driving-wheels connected together by coupling- or connecting-rods: used of a locomotive with three driving-wheels on a side, as in the mogul or ten-wheeler types. The weight of the engine for adhesion is distributed over a longer length of track or over more points of contact than when fewer wheels are used, while the use of coupling-rods enables the wheels to act in unison.


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