There are seven tramway lines supplemented by five trolleybus lines and numerous bus routes. The main railroad station in Sarajevo is in the north-central area of the city. From there, the tracks head west before branching off in different directions, including to industrial zones in the city. Sarajevo is undergoing a major infrastructure renewal; many highways and streets are being repaved, the tram system is undergoing modernization, and new bridges and roads are under construction.