Having trouble finding that information. I know we can take the train but many suggest the bus is as fast and more convenient as it drops you off in town. Correct?
Sharon
Tiemme bus lines begin at 6:25 AM. Here’s a link to the schedules.
I took the bus from Florence to Siena last March. The 131R "Rapida" takes an hour and fifteen. Here's the schedule, Lun-Sab is Monday-Saturday (Lunedi-Sabato), Festivo is the Sunday schedule:
http://www.tiemmespa.it/var/ezdemo_site/storage/original/application/6c0a2922f55de5c50baeb3fca17a553c.pdf
You can Google Florence Autostazione and Viale Tozzi, Siena to see where the pickup/dropoff points are. The bus gets very close to the old city center. The train station is down the hill, many, many escalator flights and then a good haul. Oh, and do try to sit on the top level and toward the front of the bus for a birds eye view! Be sure to get in line on the early side if you want to grab those seats. buon viaggio