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  2. Standard-gauge railway - Wikipedia

    en.wikipedia.org/wiki/Standard-gauge_railway

    George Stephenson introduced the 1,435 mm (4 ft 8 + 12 in) gauge (including a belated extra 12 in (13 mm) of free movement to reduce binding on curves [16]) for the Liverpool and Manchester Railway, authorised in 1826 and opened 30 September 1830. The extra half inch was not regarded at first as very significant, and some early trains ...

  3. Loading gauge - Wikipedia

    en.wikipedia.org/wiki/Loading_gauge

    The maximum height, width, and length of general Chinese rolling stock are 4,800 mm (15 ft 9 in), 3,400 mm (11 ft 2 in) and 26 m (85 ft 4 in) respectively, with an extra out-of-gauge load allowance of height and width 5,300 by 4,450 mm (17 ft 5 in by 14 ft 7 in) with some special shape limitation, corresponding to a structure gauge of 5,500 by ...

  4. Ray-Ban - Wikipedia

    en.wikipedia.org/wiki/Ray-Ban

    Website. ray-ban .com. Ray-Ban is a brand of luxury sunglasses and eyeglasses created in 1936 by Bausch & Lomb. The brand is best known for its Wayfarer and Aviator lines of sunglasses. In 1999, Bausch & Lomb sold the brand to Italian eyewear conglomerate Luxottica Group for a reported $640 million. [ 1][ 2]

  5. Oil pressure - Wikipedia

    en.wikipedia.org/wiki/Oil_pressure

    The oil pressure, combined with the rotation of the shaft, also hydrodynamically centers the journal in its shell and cools the bearings. Such a bearing is known as a fluid bearing. Oil pressure is higher when the engine is cold due to the increased viscosity of the oil, and also increases with engine speed until the relief valve in the oil ...

  6. 2 ft and 600 mm gauge railways in the United Kingdom

    en.wikipedia.org/wiki/2_ft_and_600_mm_gauge...

    Track gauge. The private Statfold Barn Railway in England runs railway equipment with three different track gauges. A South African Class NG G16 2-6-2+2-6-2 Garratt locomotive preserved in working condition on the Welsh Highland Railway. A list of 2 ft ( 610 mm ), 1 ft in ( 603 mm ), 600 mm ( 1 ft in ), and 1 ft in ( 597 mm) narrow-gauge ...

  7. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    Cape gauge (1,067 mm) Standard gauge (1,435 mm) Russian gauge (1,520 mm) Five foot gauge (1,524 mm) Irish gauge (1,600 mm) Iberian gauge (1,668 mm) Indian gauge (1,676 mm) This list presents an overview of railway track gauges by size. A gauge is measured between the inner faces of the rails.

  8. 2 gauge - Wikipedia

    en.wikipedia.org/wiki/2_gauge

    IIm gauge LGB Train. Gauge 2 (also called 2 gauge or II gauge) is a model railway gauge, originally 64 mm ( in ), [ 1] then standardised in 1909 at 2 in ( 50.8 mm ), a 20% reduction and a change in definition: from mm to inch. [citation needed] It has since fallen into disuse. The gauge was introduced by Märklin at the Leipzig toy fair in 1891.

  9. Mathematical formulation of the Standard Model - Wikipedia

    en.wikipedia.org/wiki/Mathematical_formulation...

    For the leptons, the gauge group can be written SU(2) l × U(1) L × U(1) R. The two U(1) factors can be combined into U(1) Y × U(1) l where l is the lepton number. Gauging of the lepton number is ruled out by experiment, leaving only the possible gauge group SU(2) L × U(1) Y. A similar argument in the quark sector also gives the same result ...

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