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→Rails: Add rail pic.
== Rails ==
== Rails ==
[[Image:Rail stack.jpg|thumb|right|250px|Flat-bottom rails showing their cross-sectional shape.]]
Rails are usually made of steel, and in cross-section are usually shaped roughly like the capital letter "I", except that the top part (the "head") is much thicker than the bottom part.
Rails are usually made of steel, and in cross-section are usually shaped roughly like the capital letter "I", except that the top part (the "head") is much thicker than the bottom part.
These rails are known as ''flat-bottom'' rails.
These rails are known as ''flat-bottom'' rails.