In the real world a railway that has a narrower then 1,435 mm is called a narrow gauge railway. Narrow gauge railways accommodate smaller radius curves, and are cheaper to build. They are often found in mountainous communities and in communities that don’t have enough traffic to justify the expense of building a standard gauge railway. Narrow gauge railway’s are often duplicated by toy trains.

The smallest gauge toy train available to toy train collectors is the Z gauge. The Z gauge operates on a track that is only 6.5 mm. The Z gauge was introduced by the Marklin Company in 1972, at the Nuremberg’s Toy Fair.  The z gauge is so small that a layout can fit inside a standard briefcase. Some Z gauge engines weigh a little as 20 grams. It is very important that a Z gauge track be kept extremely clean, a little spot of dirt can stop the tiny locomotive in its tracks and gum up all the miniature working parts.

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