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2. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   The rolling resistance of steel wheels on steel rail of a train is far less than that of the rubber tires wheels of an automobile or truck. The weight of trains varies greatly; in some cases they may be much heavier per passenger or per net ton of freight than an automobile or truck, but in other cases they may be much lighter.

3. Alloy wheel - Wikipedia

   en.wikipedia.org/wiki/Alloy_wheel

   Alloy wheel. In the automotive industry, alloy wheels are wheels that are made from an alloy of aluminium or magnesium. Alloys are mixtures of a metal and other elements. They generally provide greater strength over pure metals, which are usually much softer and more ductile. Alloys of aluminium or magnesium are typically lighter for the same ...

4. List of buildings damaged or destroyed in the September 11 ...

   en.wikipedia.org/wiki/List_of_buildings_damaged...

   Structural damage, fires ignited by jet fuel weakened the tower's steel beams, eventually causing a progressive collapse. [4] Marriott World Trade Center [5] Lower Manhattan, New York City 1981 Destroyed Sustained heavy damage in the collapse of 1 and 2 World Trade Center 54+ Did not collapse, but was declared destroyed. [6] 4 World Trade Center

5. Wheelset (rail transport) - Wikipedia

   en.wikipedia.org/wiki/Wheelset_(rail_transport)

   A rail vehicle wheelset, comprising two wheels mounted rigidly on an axle. A wheelset is a pair of railroad vehicle wheels mounted rigidly on an axle allowing both wheels to rotate together. Wheelsets are often mounted in a bogie ("truck" in North America) – a pivoted frame assembly holding at least two wheelsets – at each end of the vehicle.

6. Beadlock - Wikipedia

   en.wikipedia.org/wiki/Beadlock

   Beadlock. A beadlock or bead lock is a mechanical device that secures the bead of a tire to the wheel of a vehicle. Tires and wheels are designed so that when the tire is inflated, the tire pressure pushes the bead of the tire against the inside of the wheel rim so that the tire stays on the wheel and the two rotate together.

7. Hubcap - Wikipedia

   en.wikipedia.org/wiki/Hubcap

   Wire wheel center caps in the 1930s had a spring-loaded retention clip system that has been used on many hubcaps and center caps on every style of car and truck to the present day. [citation needed] Steel wheels in the 1930s had retention clips mounted to the wheel that snapped into a lip in the back of the cap. Wood wheels were a special option.