Ligne 4 Châtelet

MP 89 Paris metro of line 4 at Châtelet station. On the platform screen doors, you can see the RATP communication concerning the extension of the line to Bagneux, from January 13th, 2022. At the end of the video at 01:28, we can hear the audio announcement "Direction Montrouge, next train in 4 minutes". This announcement will no longer exist with the extension.