In addition to the major refurbishment of the standard cars, STIB/MIVB had a great need for modern equipment to serve the 1958 Brussels World's Fair (Expo '58), to which its organisers wished to provide public transport access from the whole city. To this end, large turning loops for hundreds of trams were laid out in the exhibition grounds. Between 1951 and 1953, the PCC car entered Brussels with motor car 7001, the start of a series of 172 cars. Over the years, many series of single-ended versions (7500 and 7700 series, 128 car) and double-ended versions (7900 series, 61 cars) followed. Eventually, the PCC car entirely replaced motor wagon and trailer combinations.
