The state which is not connected by the railway system is
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Kerala
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Himachal Pradesh
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Kashmir
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Arunachal Pradesh
D
Correct answer
Explanation
Arunachal Pradesh was among the last states to be connected by rail. While some connectivity exists now through the Harmuti Branch line, the question likely refers to the historical context when Arunachal Pradesh had minimal railway connectivity compared to other states listed. Kerala, Himachal Pradesh, and Jammu & Kashmir have had railway connections for much longer.