There are a few taxis companies which operate in many of Pakistan’s larger cities, especially for traveling from airports to city centers. 24-hour taxi firms are reasonably priced and are quite an efficient mode of transportation. Travelers should remember, however, that many companies may not operate after sunset during the holy month of Ramadan. Travelers also have the option of taking an auto rickshaw, which is convenient for transportation within cities. Rickshaws are cheap but prices should be negotiated prior to embarking on any journey.The national railway company is Pakistan Railway, which operates a comprehensive network across the country. The main line runs from Karachi to Lahore (20 hours), Rawalpindi (28 hours) and Peshawar (32 hours). Passengers also have the option to choose daytime or overnight journeys. Travelers have their choice of first and second class, but even first-class carriages can become quite hot. The better option during the peak summer season is the air-conditioned coaches. Tickets can be purchased at all local bus stations, with children under the age of three travelling for free and those under the age of 11 paying half price.