fragile economy of the Romanian state in the 1950s. The 1960s brought an era that would help expand the ITB. The first modern and locally-made trolleybuses were introduced (Rocar TV2E in 1958 and TV20E in 1970) and Karosa, and TV buses were also put into service. Starting with the 1970s, it acquired more modern vehicles, such as the V3A in 1971-1972, the Leyland Royal Tiger Worldmaster (bodied by Hargaaz and Merkavim in Israel) buses in 1969, in 1973-1974 the Ikarbus Zemun IK4 buses from Yugoslavia, the Tatra T4R trams from Czechoslovakia, and the Ikarus 260 and 280 buses from Hungary in 1974. The peak of the RATB network was maintained between 1977 and 1982 before the Bucharest Metro was built. The Rocar DAC buses and trolleybuses were introduced in 1979, set to replace some of the older material the ITB used, that dated from the 1950s and 1960s. Once with the 1980s, the network noticed a decline, mostly because according to city planners, the ITB routes could not run on the same route as the metro lines. This, combined with mass demolitions in the 1980s, would bring a total re-shape of the tram and trolleybus network, and the introduction of the so-called Maxi-Taxis. The most noticeable result was the disappearance of the North-South trolleybus corridor in 1987, once the M2 line of the metro was completed, and with its opening, a small network in the neighborhood of Berceni was left. This was supposed to be applied as a "local network", disconnected from the main network that crossed the whole city, and to be used in smaller neighborhoods, with the plan to apply it to the whole city, and remove the main trolleybus network. The tram network also saw a major reshape, which is noticeable if one compares a 1984 map of the ITB network with the one from 1992. In 1990, after the Romanian Revolution of 1989, the ITB was reorganized as the RATB (Regia Autonomă de Transport București)'', which took care of the bus, trolleybus and tram services in the town, inheriting a fleet that dated from the 1970s and 1980s. At the same time, the taxi and maxi-taxi services were separated, allowing them to be operated by private operators for the first time. During the 1990s, it slowly modernized its fleet, beginning with Ikarus 260 buses from 1991, then continuing with the modernization of the V3A tram types