Reverse Curve
A piece of track which curves in one direction and then changes direction without any appreciable length of straight track between the two curves.
Reversed (referring to signal and points levers) ...
This means use #6 or larger turnouts, avoid any reverse curves, and perhaps install a rerailer at the end of each track (I first saw this trick on the Virginian & Ohio). Make sure you can easily see and reach staging tracks to rerail cars.
Radius of the track curves is another factor to consider. The smaller the radius the more the drag. A reverse curve, without a straight line between, causes even more drag. Also remember that a clean track will reduce the drag on curves.
 See also: Loop, Rolling stock, Points, Yard, Switch
  
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