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Zig Zag (Railway)A railway zig zag is a way of climbing hills in difficult country with a minimal need for tunnels and heavy earthworks. For a short distance (corrosponding to middle leg of the letter "Z"), the direction of travel is reversed, before the original direction is resumed. Zig zags suffer from a number of possible limitations. - length of train may be limited by length of track at top and bottom points.
- reversing a train without running around engine to rear of train is hazardous.
- time lost may be painful.
On the other hand, zig zags may be a quick and cheap alternative to expensive and slow to build tunnels. Location of zig zags See also - Zig Zags are often an alternative to a spiral
* Hillclimbing (railway)
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