What's changing on the line:
- A route between Juvisy station and Athis-Mons station.
- A circular route allowing the inhabitants of Athis-Mons to easily reach the tram at the "Porte de l'Essonne" stop.
- Reliability of timetables with a bus every 20 minutes, 7 days a week.
- An unchanged opening hours, with a service from 5 a.m. to 11:30 p.m. from Monday to Friday, from 5 a.m. to 11 p.m. on Saturday and from 6 a.m. to 11 p.m. on Sunday.
- The stops "Caron", "Caron Gunsbourg", "Dagobert", "Gunsbourg" and "Les Fontaines" are no longer served by the line. The "Dagobert" stop remains served by line 483.