The backbone of the Montenegrin rail network is the Belgrade–Bar railway, which provides international connection towards Serbia. There is a domestic branch line, the Nikšić-Podgorica railway, which was operated as a freight-only line for decades, and is now also open for passenger traffic after the reconstruction and electrification works in 2012. The other branch line from Podgorica towards the Albanian border, the Podgorica–Shkodër railway, is not in use.