Alongside the Bus and Tram services, the Metro system operates from 5am to midnight. Services are fast and frequent and there is a map at every metro station and on every train. There are three main lines: line A (marked in green) which runs from Dejvicka to Depo Hostivar; line B (yellow) runs from Zlicin to Cerny Most; and line C (red) runs from Haje to Ladvi.  When you buy a ticket before boarding you punch it in a small yellow machine in the metro station. Any ticket unstamped incurrs a 700 Kč fine; a 50 Kč fine incurs if you are travelling with luggage and do not have a ticket.