Central London
Sure enough, a Cleansed faction was formed within Central London, and over time that part of the city was walled off entirely, with all original trains terminating outside its walls to pass through "decontamination". New trains were built with decontamination sprays at every carriage, and all passengers hoping to gain access to the inner city were required to change onto one of these new trains.
Demographics
Central London is entirely controlled by the Cleansed and, as such, is mostly inhabited by middle to upper class people and business owners.
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