Yes.
Short info on this ::
Train which brings people from Pakistan stops at Attari n people complete their formalities like verification of migration papers, other papers and luggage get examined as it is done at airport, perhaps they are scrutinized more closely.
Once these formalities are done away with, which easily takes four to five hours, they shift to the Indian train....
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The train which has brought passengers from our side visiting Pakistan are exchanged and trains return back to their respective destinations.