A crossover is where two sets of tracks intersect, but the locomotive can not switch from one track to the other like it can at a switch... Another common term for this is a "diamond"... In model railroading, the crossings come in 90, 45, 30, and 15 degrees...
A two rail reverse loop needs to be isolated due to the polarity of the track reversing on itself (black section). The crossover makes a figure 8 and does not need any isolation. With 2 crossovers you can have two separate ovals overlapping at two points like two chain links.
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