This article is from the Paris, France FAQ, by Thierry E. Toniutti and Delphine Kensit nemo_n@yahoo.com.
The RER and Metro service starts at about 5h30 and ends between 00h45
and 1h15 depending on the station. Most buses run till 20h00, and some
lines run on a reduced curcuit between 20h00 and 22h00.
 
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