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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   Modern fifth wheels allow the trailers to slide into the fifth wheel and lock into it very reliably when maintained and serviced properly. The engagement of the king pin into the fifth-wheel locking mechanism is the only means of connection between tractor and trailer; no other device or safety mechanism is used.

3. Kingpin (automotive part) - Wikipedia

   en.wikipedia.org/wiki/Kingpin_(automotive_part)

   The kingpin (also king-pin, king pin and k pin) [1] [2] is the main pivot in the steering mechanism of a car or other vehicle. The term is also used to refer to part of a fifth wheel coupling apparatus for a semi and its trailer or other load.

4. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   The towing vehicle has a wide coupling plate known as a fifth-wheel coupling bolted onto its chassis, on which the semi-trailer rests and pivots. As the tractor reverses under the trailer, a kingpin under the front of the trailer slides into a slot in the skid plate, and the jaws of the fifth wheel close onto it.

5. List of railroad truck parts - Wikipedia

   en.wikipedia.org/wiki/List_of_railroad_truck_parts

   An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.

6. M-209 - Wikipedia

   en.wikipedia.org/wiki/M-209

   Since the key wheels are set to the string "AAAAAA", the active pins are "PONMLK"; according to the settings above, pin "P" is ineffective on the first key wheel, pin "O" is effective on the second key wheel, "N" is effective on the third, "M" is effective on the fourth, "L" is ineffective on the fifth, and "K" is effective on the sixth.

7. Fifth Wheel Truck Stops - Wikipedia

   en.wikipedia.org/wiki/Fifth_Wheel_Truck_Stops

   Between 1993 and 2010, further chapels were established at Fifth Wheel's other Southern Ontario locations, which laid the base for expansion to other sites across Canada. [9] In 1993, the chain's business model was converted to that of a franchising operation. [10] The Fifth Wheel faced competition from the TravelCenters of America and Flying J ...