In both cases, the Metrotram was intended to serve only an interim, albeit necessary, role, with provision for conversion into a full metro system. Construction in both cities began simultaneously in the mid 1970s. In Volgograd, this involved separating off an existing tram route with an underground section in the city center. In Kryvyi Rih, however, the Metrotram route was built from scratch, albeit in a similar manner, with most of the section running along the surface, except in the very center of the city. All of the underground dimensions were made with provision for eventual conversion into a full metro system.