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  2. Adhesion railway - Wikipedia

    en.wikipedia.org/wiki/Adhesion_railway

    The adhesion railway relies on a combination of friction and weight to start a train. The heaviest trains require the highest friction and the heaviest locomotive. The friction can vary a great deal, but it was known on early railways that sand helped, and it is still used today, even on locomotives with modern traction controls.

  3. List of steepest gradients on adhesion railways - Wikipedia

    en.wikipedia.org/wiki/List_of_steepest_gradients...

    Former logging railway, steepest non-electrified adhesion railway 1 in 9 (11%) or 1 in 10 (10%) Estrada de Ferro Campos do Jordão, Brazil: 22 existing railways merged and nationalised in 1953 1 in 9.5 (10.5%) Roaring Camp & Big Trees Narrow Gauge Railroad, California, United States: 1963: 3ft narrow gauge heritage railroad 1 in 10 (10%)

  4. Slippery rail - Wikipedia

    en.wikipedia.org/wiki/Slippery_rail

    Slippery rail, or low railhead adhesion, [1] [2] [3] is a condition of railways (railroads) where contamination of the railhead reduces the traction between the wheel and the rail. This can lead to wheelslip when the train is taking power, and wheelslide when the train is braking.

  5. Frictional contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Frictional_contact_mechanics

    Adhesion railwayRailway relying on adhesion to move trains; Bearing – Mechanism to constrain relative movement to the desired motion and reduce frictions; Contact mechanics – Study of the deformation of solids that touch each other (Linear) elasticity – Physical property when materials or objects return to original shape after ...

  6. Nadal formula - Wikipedia

    en.wikipedia.org/wiki/Nadal_formula

    Typically, the axle load for a railway vehicle should be such that the lateral forces of the wheel against the rail should not exceed 50% of the vertical down-force of the vehicle on the rail. [2] Put another way, there should be twice as much downward force holding the wheel to the rail, as there is lateral force which will tend to cause the ...

  7. Electric multiple unit - Wikipedia

    en.wikipedia.org/wiki/Electric_multiple_unit

    A DART 8500 class commuter EMU at Howth Junction railway station, Ireland. An electric multiple unit or EMU is a multiple-unit train consisting of self-propelled carriages using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a number of the carriages.

  8. Contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Contact_mechanics

    Adhesion railwayRailway relying on adhesion to move trains; Adhesive surface forces – Molecular property; Bearing capacity – Capacity of soil to support loads; Collision – Instance of two or more bodies physically contacting each other within a short period of time; Contact dynamics – Motion of multibody systems

  9. Hunting oscillation - Wikipedia

    en.wikipedia.org/wiki/Hunting_oscillation

    A classical hunting oscillation is a swaying motion of a railway vehicle (often called truck hunting or bogie hunting) caused by the coning action on which the directional stability of an adhesion railway depends. It arises from the interaction of adhesion forces and inertial forces.