Several proposals came immediately before and after the Second World War calling for modernizing the existing tramways with a network of lines running underground, but all were scrapped due to material shortages. Instead, the system, so badly damaged by the conflict, was almost completely dismantled during the following decade and replaced by buses (with the exception of line 68). However, by 1960, the city was suffering from severe congestion due to the growth in automobile use.
Several proposals emerged before and after World War II advocating for modernizing existing tram networks by underground lines, but these were all abandoned due to material shortages. Instead, the system was largely dismantled during the following decade and replaced with buses (with the exception of line 68). However, by 1960, the city faced severe traffic congestion due to rising automobile usage.