A grand union is a rail track junction where two double-track railway lines cross at grade, often in a street intersection or crossroads. A total of sixteen railroad switches (sets of points) allow streetcars (or in more rare installations, trains) coming from any direction to take any of the three other directions. The same effect maybe achieved with two consequent wyes if the location allows for space.
Read more about Grand Union: Complexity, Three-Quarter, Half, and Butterfly Unions, Examples
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—Thomas Carlyle (1795–1881)
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—Benjamin Harrison (1833–1901)