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2017 Examine the development of secondary economic activity in a Sub…

- - - - Underground Rail system
  - - - Dirt/sand Tracks
      - Animal drawn carts
        
        Oxen
      - Only half the roads are tarred
    - - 2.1 million km of road network
      - Huge pressure
        
        Kolkata, Mumbai &chennai
        
        Need modernisation
    - - 5 out of 1000