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  2. G scale - Wikipedia

    en.wikipedia.org/wiki/G_scale

    The 45 mm gauge originated from 1 gauge or "gauge one" which was first used in Europe and Britain and used to model standard gauge trains in the scale of 1:32. LGB were first to adopt the term G scale and used the gauge of 45 mm (1.772 in) to model 1,000 mm gauge European trains in 1:22.5 scale.

  3. Scale of chords - Wikipedia

    en.wikipedia.org/wiki/Scale_of_Chords

    A chord is a line drawn between two points on the circumference of a circle. Look at the centre point of this line. For a circle of radius r, each half will be ⁡ so the chord will be ⁡. The line of chords scale represents each of these values linearly on a scale running from 0 to 60.

  4. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    The most popular scale in Japan. For models of Shinkansen high speed trains and other systems using standard gauge track, the international N scale standard ratio of 1:160 is commonly used. TT9: 1:120: 9 mm (0.354 in) Used also in New Zealand. HOn 2 + 1 ⁄ 2: 1:87: 9 mm (0.354 in) Used for 2 ft 6 in (762 mm) narrow gauge. 13 mm: 1:80: 13 mm (0 ...

  5. Loading gauge - Wikipedia

    en.wikipedia.org/wiki/Loading_gauge

    The standard defines static envelopes for trains on the national network as T, T c and T pr. The static profile 1-T is the common standard on the complete 1520 mm rail network including the CIS and Baltic states. The structure clearance is given as S, S p and S 250. There is a tradition that structure clearance is much bigger than the common ...

  6. USA Trains - Wikipedia

    en.wikipedia.org/wiki/USA_Trains

    USA Trains is a manufacturer of G scale model railroad products that started out as Charles Ro Manufacturing Company. [1] They offer two different scale sizes of trains that use the same track; the "Ultimate Series," which is 1:29 scale, and the "American" and "Work Trains" series which is 1:24 scale.

  7. Minimum railway curve radius - Wikipedia

    en.wikipedia.org/wiki/Minimum_railway_curve_radius

    Too tight a 'crest' curve could result in the train leaving the track as it drops away beneath it; too tight a 'trough' and the train will plough downwards into the rails and damage them. More precisely, the support force R exerted by the track on a train as a function of the curve radius r, the train mass m, and the speed v, is given by

  8. Chord (geometry) - Wikipedia

    en.wikipedia.org/wiki/Chord_(geometry)

    Equal chords are subtended by equal angles from the center of the circle. A chord that passes through the center of a circle is called a diameter and is the longest chord of that specific circle. If the line extensions (secant lines) of chords AB and CD intersect at a point P, then their lengths satisfy AP·PB = CP·PD (power of a point theorem).

  9. I–V–vi–IV progression - Wikipedia

    en.wikipedia.org/wiki/I–V–vi–IV_progression

    The I–V–vi–IV progression, also known as the four-chord progression is a common chord progression popular across several genres of music. It uses the I, V, vi, and IV chords of a musical scale. For example, in the key of C major, this progression would be C–G–Am–F. [1] Rotations include: I–V–vi–IV : C–G–Am–F

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