After a major period of construction between 1900 and 1935, and another between 1955 and 1980, which witnessed a first wave of modernisation with the introduction of automatically controlled trains, centralised control rooms (PCCs) and a new generation of rolling stock, RATP has now entered a third phase, in which it must confront the challenges of the decades ahead.

- anticipate the obsolescence of
metro machinery;
- adapt the transport network to changes in living patterns and ever-increasing
customer numbers;
- meet the needs of increasingly demanding customers in terms of safety,
comfort, regularity of service, flexibility and information.
These big ambitions will be achieved through a number of projects that will be rolled out across the network over the next 15 years, together accounting for more than €1 billion of investment for RATP (excluding rolling stock).
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