The distance between the inner edges of the heads of the rails is called the gauge.
Is the gauge not to confused with the "loading gauge" which is the height and width of a vehicle above the rails. Standard rail gauge is 4ft 8.5ins (1.435m) as used in Europe, the US, Canada, North Africa and Australia
Metal can expand slightly when heated by the sun, a small gap allows the rail to expand, that said modern rail tracks are welded and do not have these gaps.
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The only purpose for copper that I have seen on railroad tracks is as a connector between rail ends for signal conductivity purposes
Interlocking joints between railroad tracks are called compromise bars. They are a set of rail joint bars that connect rails of two different sizes.
Trains that run on tracks.
The way a person can keep their train from jumping the tracks is to make sure the tracks are well maintained. This means the tracks should always be on a level and cleaned surface so that nothing gets between the rail and the train wheel.
They are used for trains to ride on them
Rail tracks
A rail is a what a train runs on. A pair of parallel rails is known as a track. A train is a collection of one or more vehicles, connected together, which run on railway tracks.
The width apart of rail tracks are set to the gauge of the trains and carriages that are allowed to run on those tracks. They are kept in position by wooden sleepers, though concrete sleepers are often used nowadays.
Rail Road Tracks