NMBS/SNCB 5537 passes the huge viaduct of Moresnet with a freight train to Antwerpen.
Photo ID: 623934 shows the same viaduct in nearly its total length.
Trains on the Montzen route between Antwerp (Belgium) and Aachen (Germany). Particularly the section known as Line 24 that crosses the Remersdaal and Moresnet viaducts.