S1: Calcutta unlike other cities keeps its trams.
P: As a result there horrendous congestion.
Q: It was going to be the first in South Asia.
R: They run down the centre of the road.
S: To ease in the city decided to build an underground railway line.
S6: The foundation stone was laid in 1972.
The proper sequence should be:
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Look for cause–effect links and solution statements to arrange sentences correctly.
Step 1: Sentence R explains the functioning of trams mentioned in S1.
Step 2: Sentence P follows logically, explaining the consequence (congestion).
Step 3: Sentence S gives the solution to the congestion problem.
Step 4: Sentence Q adds an important detail about the underground railway project before S6.