I don't know how they are to work or be incarcerated in, but from the outside Chennai's old police stations are among the more charming features of the city. Now a number of them will be torn down as part of a modernisation drive. There's an article about them in The Hindu: Demolition Row. The article includes lists of stations to go, and those that will stay -- but it doesn't mention the one on Royapettah High Road, one of my favourites.
This picture of a typical station, by R. Ragu, accompanies the article. The woman in front of the station is wearing a sari in the traditional Tamil brahmin style, which is slowly dying out: