Which of the following zonal headquarters – city combination is incorrect?

The correct answer is C. East Central – Hajipur.

The zonal headquarters of the East Central Railway Zone is located in Ranchi, Jharkhand. The other zonal headquarters are:

• North Central Railway Zone: Allahabad, Uttar Pradesh
• North Eastern Railway Zone: Gorakhpur, Uttar Pradesh
• North Western Railway Zone: Jaipur, Rajasthan
• South Central Railway Zone: Secunderabad, Telangana
• South Eastern Railway Zone: Kolkata, West Bengal
• South Western Railway Zone: Hubli, Karnataka
• Western Railway Zone: Mumbai, Maharashtra
• East Coast Railway Zone: Bhubaneswar, Odisha
• West Central Railway Zone: Jabalpur, Madhya Pradesh