Arriving by train you can find a shopping mall in front of the train station. Inside there is an escalator that will take you up to the city centre, situated just beyond an ancient door called Porta Camollia. You can start your Siena tour from this door wich is the etrance the “Contrada dell'Istrice” (meanin "porcupine district").
The Contrades of Siena were ancient institutions that may be compared to districts, each one having its own government, emblems, colours, coat of arms, titles of nobility, festivities, patron Saints, delimited territories and population. But we'll talk about this later.
If you take Camollia Street you will enoy the magic of the historical city center of Siena. Go straight on this street, even when its name changes into Via Banchi di Sopra.