=Passenger Service.=--Passenger traffic is more easily managed than the movement of freight. For the greater part the rates are fixed by law. On a few eastern roads local rates are two cents per mile; in the main, however, a three-cent rate prevails, except that in sparsely peopled regions the rates are four and five cents per mile. On many roads 1,000-mile books are sold at the rate of twenty dollars; on some the rate is twenty-five dollars per book. Long-distance rates involving passage over several roads are somewhat less than the local rates. These rates are determined by joint passenger-tariff associations. Each individual road fixes its own excursion and commutation rates; one or another of the joint passenger associations determines the rates where several roads divide the traffic. The latter are usually one, or one and one-third fares for the round trip. Except on a few local roads in densely peopled regions the passenger service is much less remunerative than freight business, and not a few railways would abolish passenger trains altogether were they permitted to do so. Rate-cutting between competing roads has not been common since the existence of joint passenger associations. It is sometimes done secretly, however, through the use of ticket-brokers, or "scalpers," who are employed to sell tickets at less than the usual rate; it is also done by the illicit use of tickets authorized for given purposes, such as "editors'," "clergymen's," and "advertising" transportation. In many instances, where several roads have the same terminal points, it is customary for the road or roads having the quickest service to allow a lower rate to the others. Thus, of the seven or eight roads between New York and Chicago, the two best equipped roads charge a fare of twenty dollars on their ordinary, and a higher rate on their limited, trains. Because of slower time the other roads charge a sum less by two or three dollars for the same service. This cut in the rate is called a "differential." =Railway Mileage.=--The railways of the world in 1900 had an aggregate of nearly four hundred and eighty thousand miles distributed as follows: North America 216,000 Europe 173,000 Asia 36,000 South America and West Indies 28,000 Australasia 15,000 Africa 12,000 In western Europe and the eastern United States there is an average of one mile of railway to each six or eight square miles of area. In these countries railway construction has reached probably its highest development, and the proportion seems to represent the mileage necessary for the commercial interests of the people.