On 15 November, Paris public transport operator RATP opened the western extension of tramline T1 from Saint Denis to Asnières-Gennevilliers-Les Courtilles where it reaches the northern terminus of Metro line 13. It also passes beneath RER line C at with a stop at Gennevilliers Station.
See these links for RATP's news about the new line or, to see how the extension fits in with existing lines, see RATP's interactive map.