Line 80 is a Luxembourgian railway line connecting Rodange to Belgium. It is designated Chemins de Fer Luxembourgeois, but predominantly operated by NMBS/SNCB. The services overlap with those designated as Line 70. On the Belgian side of the border the routes are numbered in the NMBS/SNCB series.
The routes are all electrified at 25kV using OHL cf NMBS/SNCB's normal 3 kV DC OHL. This requires NMBS/SNCB to use Class 41xx DMUs.