Iron is iron . . . but rails are made of high-strength steel. (Which is made from iron.)
Iron is rarely used anymore in railway lines. Steel is used mostly now because it is very flexible and is less vulnerable to cracking and chipping.
The key element in railway lines depending on the railway line is, occasionally copper, magnesium and stainless steel.
C-Mn steel
Iron filings can be used to demonstrate magnetic field lines by sprinkling them around a magnet. The filings align along the magnetic field lines, making the invisible magnetic field visible.
Iron filings can be used to visualize a magnetic field because they are attracted to the magnetic field lines produced by a magnet. This allows the iron filings to align along the magnetic field lines, making the field visible.
Iron filings are commonly used to demonstrate the lines of magnetic force around a magnet. When sprinkled around a magnet, the filings align themselves along the magnetic field lines, making the field visible.
They are used so that the railway track doesn't compress or move, and stay's the same so the train doesn't squash the track.
Iron filings are tiny pieces of iron that are used in science experiments to visualize magnetic fields. When sprinkled around a magnet, the iron filings align with the magnetic field lines, making them visible and helping to demonstrate the shape and direction of the magnetic field.
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The reason for use of iron making garden gates is that they are resistant to corrosion.
Because iron is a cheap metal.
Iron is an excellent conductor of magnetic lines of force due to its high magnetic permeability. This property allows iron to easily attract and retain magnetism, making it a common material used in electromagnets and magnetic cores in transformers and electric motors.