The historical centre of Santiago de Compostela stretches around the Cathedral, the one and only destination of all pilgrimages, and it is entirely reserved to pedestrians, therefore the use of public transports may be superfluous for your visit of the medieval town.
There is no underground, but thanks to a good bus network managed by the urban transport company named Tussa , visitors can easily move along the most interesting itineraries. The bus system also connects with the suburbs, the train station and the parking areas.
The train station is close to the historical centre, and buses are quite new and provided with access for disabled people. Tickets can be purchased on board by the driver (you must get on using the front doors)
For info: www.tussa.org (only in Spanish language)
Those who arrive in Santiago by car can make use of the numerous parking areas and reach the cathedral on foot, by bus or by taxi.