Three-Quarter, Half, and Butterfly Unions
Three-quarter unions are similar to grand unions in that they are also rail track junctions where two double-track railway lines cross at grade, often in a street intersection or crossroads; the primary difference being that one corner of the crossing does not have curved junction tracks, with the union having a total of twelve railroad switches (sets of points).
Half unions are similar, but only have curved junction tracks on two adjoining corners of the intersection, with a total of eight switches/points.
Butterfly unions share the total of eight switches/points, but the curved junction tracks are on opposing corners.
Read more about this topic: Grand Union
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