Hi @chetanpadliya You are correct for 20th century,But in 21 century longest railway platforms are:
Gorakhpur railway station, Uttar Pradesh, India:1,366.33 m (4,483 ft) (longest in the world)
Kollam Junction, Kerala, India:1,180.5 m (3,873 ft)
Kharagpur, West Bengal, India: 1,072.5 m (3,519 ft)
State Street subway, Chicago, Illinois, US: 1,067 m (3,501 ft) (longest in North America)
@sbanerjee0017