Why go
A Florence-to-Siena bus may bring you closer to the walled centre than the railway station, while train travel can offer a different route through the countryside. Driving requires a parking plan outside the pedestrian core. Comparing those final approaches matters more than an old timetable or fare.
The full story
Siena sits above its railway station, so reaching the station is not the same as reaching Piazza del Campo. From the station, the final approach to the historic centre climbs toward the city walls. Local buses and other connections can shorten that uphill leg; check current services before travel. Intercity buses from Florence have historically arrived nearer the centre, though terminals and routes can change. If you drive, treat parking and the walk into the old town as separate steps rather than aiming your vehicle at the Campo. Florence and Pisa are common gateways for travellers arriving by air, but the best onward combination depends on current rail and bus links. A useful comparison is where each option leaves you relative to your first stop: the cathedral area, Piazza del Campo or accommodation elsewhere in Siena's hilly centre.