There is a reduced system on Sundays and bank holidays. You can purchase your ticket at the ticket window in any Tube station, or from a ticket machine. The Underground system is divided in 6 travel zones, and fares are based on the distance travelled. As long as you don't leave a station, you can use the same ticket. Single or Return tickets are available.
Underground maps are available free from most tube ticket windows.
Each line has a name and is colour coded. North, South, East or West indicates directions. There are distinctive symbols for interchange stations and connections with National Railways. Transportation - Bus Buses are slightly cheaper than undergrounds, but often slower. Tickets can be bought on the bus.