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Option 1: Shatabdi Express is a high-speed train that operates on several routes in India. However, it does not run between New Delhi and Wagah.
Option 2: Thar Express is an international train that connects Jodhpur in India with Karachi in Pakistan. It does not run between New Delhi and Wagah.
Option 3: Maitree Express is a train that runs between Kolkata in India and Dhaka in Bangladesh. It does not run between New Delhi and Wagah.
Option 4: Samjhauta Express is the correct answer. It is a bi-weekly train that operates between Delhi and Atari (near Wagah border). It is a symbol of friendship between India and Pakistan and has been running since 1976, facilitating people-to-people contact between the two countries.
Therefore, the correct answer is option 4, Samjhauta Express.