You can buy tickets by bars, bookstalls, tobacco's and automatic distributors. A book of 10 tickets gives you a small save. Maps with paths of public transports are sold by some tube stations. Recently the new railway link up was opened. Now it's not complet, but it's 8 Km.
Tariffs are the same of other transports.
The same kind of ticket can be used on all public transport vehicles and can be obtained at new-agents, bars and tobacconists. On underground railway stations there are automatic machines. On trams, buses and trolley buses, tickets are stamped on board and can be re-used in all directions up to expiry. On the Underground, tickets are stamped at the tumstiles and are valid for a single journey. At connecting stations, however, passengers can change line without any extra charge.