Railroad tracks used to be joined with fish plates, metal gussets bolted across the sides of the joints between tracks. Now they are welded into continuous ribbons of steel.
Train railroads are joined together by a process called exothermic welding – a chemical called Thermite is lit off and then sends molten iron into a mould.
This causes the thermite to melt, which in turn melts the plug at the bottom of the cruicle, sending the iron into the gap left between the two railtracks.
The reduction of a metal oxide to form metal by using aluminium powder as a reducing agent is called a thermite reaction.
This reduction property of aluminium is used in thermite welding for joining the broken pieces of heavy iron objects like girders, railway tracks or cracked machine parts
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