The Samjhauta Express, a passenger train service between India and Pakistan, runs from Delhi to which major city located in Pakistan?

Introduction / Context:
This question relates to India–Pakistan relations and international transport links. The Samjhauta Express is one of the most well known train services connecting the two countries. Knowing the endpoints of such services is useful for general knowledge and questions about regional connectivity.

Given Data / Assumptions:

• The train is the Samjhauta Express.
• It operates between Delhi in India and a city in Pakistan.
• Options include Karachi, Islamabad, Quetta and Lahore.
• We assume standard peacetime routing of the train as historically operated.

Concept / Approach:
The Samjhauta Express connects Delhi with Lahore in Pakistan. The route passes through Attari and Wagah at the border and terminates at Lahore, which is a major city in the Pakistani province of Punjab. Karachi, Islamabad and Quetta are important Pakistani cities, but they are not the stated endpoint of this particular train.

Step-by-Step Solution:
Step 1: Recall that Samjhauta Express is historically referred to as the Delhi–Lahore train. Step 2: Remember that it crosses the international border at Attari–Wagah and proceeds towards Lahore. Step 3: Identify Lahore among the options as a major city relatively close to the border compared to Karachi or Quetta. Step 4: Note that Islamabad, while a capital city, is not the designated terminus of the Samjhauta Express. Step 5: Select Lahore as the correct Pakistani city for the route.

Verification / Alternative check:
Railway information, news reports and historical accounts of India–Pakistan train services consistently describe the Samjhauta Express as running between Delhi and Lahore. Even in discussions of suspensions or resumptions of the service, it is always referred to as the Delhi–Lahore train, confirming the route.

Why Other Options Are Wrong:
Karachi: A major port city in southern Pakistan, but the Samjhauta Express does not run to Karachi.

Islamabad: Pakistan's capital city, located inland, not the endpoint of this particular train service.

Quetta: A city in Balochistan, far to the west and south, not connected by the Samjhauta Express route mentioned here.

Common Pitfalls:
Some students may wrongly choose Islamabad, thinking that international trains must connect capital cities. Others may guess Karachi simply because it is a large and well known city. The safe approach is to specifically remember that Samjhauta Express is the Delhi–Lahore train that passes through the Wagah–Attari border.

Final Answer:
The Samjhauta Express runs from Delhi in India to Lahore in Pakistan.