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Railway tracks electrical lines
Railway tracks, the opposite edges of a rule.
If the tracks are not parallel, the wheels will not stay on the tracks; train wheels are spaced at a fixed width, or gauge, and that width cannot expand or contract to accommodate non-parallel tracks. Thus, if the tracks were non-parallel, the wheel would come off the track and cause a derailment.
parallel?? Parallel is usually used to talk about lines or similar it means they are equal distance apart. For example railway tracks are parallel.
A parallelogram. Special cases a square, a rectangle, and a rhombus. Regular polygons with an even number of sides, ( hexagons, octagons etc.) also have opposite sides that are parallel. A pair of parallel lines (eg. straight railway tracks) also has 2 sides that are parallel.