Rolling Stock
Initially, the system was a completely diesel network. Because of the many different kinds of electrical specifications (voltages and current types - alternating current and direct current) used in the different countries it was thought at that time that use of diesel-hauled trains or diesel multiple-unit trainsets would greatly speed up border crossing. Moreover, at that time many border crossing sections were not yet electrified. The German DB built the streamlined DB Class VT 11.5, while the Swiss Federal Railways (SBB) and the Dutch NS developed the RAm / DE, both diesel trains.
However, the creation of the international TEE network 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 Class 15 locomotives (originally called Class 150) in 1962, capable of handling three different voltages, followed by the four-voltage 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.
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