I found more about this trick on wikipedia - "Sorcar's signature trick is the use of light refraction to convey the impression that large scale objects have vanished. Past performances have included the "disappearance" of the Taj Mahal and the Indore – Amritsar Express. On 8 November 2000, Sorcar "vanished" the Taj Mahal for two minutes in Kachhpura in Agra. He also made the Victoria Memorial disappear on the 300th anniversary of Calcutta, and vanished a train full of passengers before a large crowd at Bardhaman Junction, West Bengal, India in 1992." Source :
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