there are 40 such routes (but only the N101-N102 and N202 have at least one departure every hour, seven days). Green Owl buses are identified by the letter N followed by three numbers (e.g. N101). It has been noted that real-time indicators at bus stops usually display only the number of a route, and not the "N" at the beginning, which can be a cause of confusion for visitors, as the route 101 can have a completely different destination to the route N101 (for example). Sweden Stockholm: SL operate all of Stockholm's land based public transport systems north and south of the city, including night buses. There are about 500 bus routes in total in Stockholm, of which 50 are night buses. Bus route numbers that are in the 90s or have 90s at the end of their number are distinguishable as night buses, such as routes 94, 191, 291, 592 and 890. Most night buses operate Mon-Sun (with an increased frequency on Sat, Sun nights and nights before Public Holidays) between approximately 01:00 and 05:00/06:00. Some routes operate as frequently as every 20–30 minutes, such as route 96 (01:18 - 05:53) whereas others such as route 396 operate every hour (02:17-04:18). Tickets cost the same day and night. Malmö : Øresundståg is a 24/7 train between Østerport via Copenhagen in Denmark to Malmö and Lund in southern Sweden. Switzerland Zürich: Zürcher Verkehrsverbund (or ZVV), is a public transportation system that combines rail, bus, tram, trolleybus, lake boat, cable car and other services in the Swiss canton of Zürich integrating them all into a single fare network with coordinated timetables. Zürich's nighttime network includes 17 night routes split between S-Bahn night trains as well as night buses. Since 2007, some S-Bahn night train lines provide a continuous 24-hour service from Friday morning until Sunday evening. A regular daytime ticket is sufficient for the use of the ZVV night network. All night buses and night S-Bahn trains are marked specially with the letter «N». The night services operate on Friday and Saturday nights, general holidays and some special occasions. Rest of Switzerland: At weekends, passengers can travel by train at night in many regions and urban areas throughout Switzerland. These services are known by different names in different areas of the country, but include Nachtexpress, Moonliner, Noctambus, Mobinight, Pyjama Bus and Afterbus. Turkey Istanbul: Istanbul had operational bus routes, share taxis