Taxis are a convenient way of getting around cities in Sudan and fares are inexpensive. There are two types of taxis available to travelers. There are the usual taxis which take one passenger from point A to point B. These taxis are not metered, so fares need to be agreed upon before departure. Then there are bakassis, which are minibus shared taxi that have no set stops but simply pick people up and drop them off as requested. Both types of taxi can simply be flagged down from the side of the road. An efficient and inexpensive way of traveling between cities is by the local train system. The train network in the country is extensive, with the main line connecting Wadi Halfa in the north to Khartoum near the south. The total journey takes about two days but the train makes several stops along the way at which travelers can stock up on refreshments. There are also lines between Nyala and Er-Rahad, and Khartoum and Port Sudan. Travelers have a choice of first class seats (which are comfortable), sleeper carriages, and second and third class seats, which are far more rustic.