As many people will attempt to steal the gold railing during the reign of the great and later Mughals of Delhi.
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Jaysid answered this
As it was described that Taj Mahal was monument that made by white marbles. The cenetophs were enclosed by a gold railing , which was encrusted with pearls , rubies and diamonds . Later, the gold railings were replaced by the marble railings as the former had precious materials encrusted .
