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The question is asking us to identify the pair that does not correctly match the Indian Railway Zone with its headquarters.
Option 1: North Eastern Railway : Gorakhpur
This option correctly matches North Eastern Railway with its headquarters in Gorakhpur.
Option 2: Eastern Railway : Kolkata
This option correctly matches Eastern Railway with its headquarters in Kolkata.
Option 3: Central Railway : Mumbai
This option correctly matches Central Railway with its headquarters in Mumbai.
Option 4: Southern Railway : Secunderabad
The correct answer is option 4. Southern Railway is incorrectly matched with its headquarters in Secunderabad. The headquarters of Southern Railway is actually located in Chennai, not Secunderabad.
Therefore, option 4 is the correct answer as it does not correctly match the Indian Railway Zone with its headquarters.
Alert - correct answer should be Southern Railway: Chennai.