provided impetus for the development of special electric trainsets and electric locomotives, capable of operating at two or more different voltages. The DB used the 160 km/h E 10.12 and the 200 km/h DB Class 103, among other types. The SBB developed its RAe TEE II electric trainset, which was designed for four different railway electrification systems, and this type entered service in 1961. Belgian National Railways introduced its Type 150 locomotives (now called Class 15) in 1962, capable of handling three different voltages, followed by the four-voltage Type 160 (Class 16) in 1966 and Class 18 in 1973. Meanwhile, France's SNCF also developed and introduced ten quadruple-voltage locomotives, its Class CC 40100, between 1964 and 1970. By 1975, all but two (L'Arbalète and Bavaria) of the 43 TEE trains were electrically powered, and most were locomotive-hauled. Modification of service Originally the idea was to promote only international routes as TEE routes. This idea was abandoned in 1965 with the introduction of the French Le Mistral and the German Blauer Enzian. Later, TEE trains serving single countries were also introduced on other routes in France and Germany as well as in Italy, but most TEE routes continued to be international. Growth The network grew in the course of the years, adding three more countries: Spain (Renfe), Denmark (DSB) and Austria (ÖBB). The system reached furthest in 1974. However, of these three only Renfe became a TEE member; the other two countries had TEEs running through them but the rail administrations were never members. In the late 1970s, the TEE network comprised 39 different named trains, serving 31 routes. A few routes had more than one TEE train concurrently; for example, the Paris–Brussels route had four TEEs, running at different times of the day. Contraction and end From the late 1970s onward, gradually more and more Trans-Europe Express trains were replaced by other trains giving a similar kind of service but also carrying 2nd class. Business travellers used air travel more and more. In 1979 DB completely restructured the network with the coming of the new national InterCity services, resulting in successively fewer TEE services and more InterCity services in the course of time. The introduction of the TGV service in France in 1981, and its subsequent expansion, along with expansion of high-speed rail lines in other European countries led to still more TEEs' being replaced by domestic high-speed trains. After