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2. List of reporting marks: C - Wikipedia

   en.wikipedia.org/wiki/List_of_reporting_marks:_C

   Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.

3. Axle - Wikipedia

   en.wikipedia.org/wiki/Axle

   Semi-trailers usually have a tandem axle at the rear. Axles are typically made from SAE grade 41xx steel or SAE grade 10xx steel. SAE grade 41xx steel is commonly known as "chrome-molybdenum steel" (or "chrome-moly") while SAE grade 10xx steel is known as "carbon steel". The primary differences between the two are that chrome-moly steel is ...

4. George Walther Sr. - Wikipedia

   en.wikipedia.org/wiki/George_Walther_Sr.

   George Walther Sr. (August 13, 1876 – April 10, 1961) was an American inventor, engineer, businessman, civic leader and the holder of over 100 patents for truck wheels, brake drums, fifth wheels, and landing gear/legs for the trucking industry.

5. Bogie - Wikipedia

   en.wikipedia.org/wiki/Bogie

   Special flanged steel wheels are behind the rubber-tired running wheels, with additional horizontal guide wheels in front of and behind the running wheels, as well. The unusually large flanges on the steel wheels guide the bogie through standard railroad switches, and in addition keep the train from derailing in case the tires deflate. [12]

6. Custom wheel - Wikipedia

   en.wikipedia.org/wiki/Custom_wheel

   Custom wheel spinners for custom wheels then came about in the late 1990s and got extremely popular in the new millennium. The popularity has even grown further by the introduction of larger wheel and spinner diameters such as 18" / 20" / 22" / 24" / 26" and even up to 30" inch wheels diameters.

7. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The coupling consists of a kingpin, a 2-or-3 + 1 ⁄ 2-inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel on the rear of the towing vehicle. As the connected truck turns, the downward-facing surface of the semi-trailer (with ...