| Box Width: | auto |
| Belgian railway line 37 | |
| Status: | Operational |
| Locale: | Belgium, Germany |
| Start: | Liège-Guillemins |
| End: | Aachen Hauptbahnhof |
| Open: | 1842-1843 |
| Operator: | National Railway Company of Belgium |
| Linelength: | 54km (34miles) |
| Tracks: | double track[1] |
| Speed: | 140km (90miles) |
| Map State: | collapsed |
The Belgian railway line 37 is a railway line in Belgium connecting Liège to Aachen in Germany. Completed in 1843, the line runs 47.4 km in Belgium.[2] and another 6.8 km in Germany. It is the first and oldest cross-border railway line worldwide. Since 2009, high speed trains running between Brussels and Aachen use the HSL 3 instead of the line 37 between Chênée and Hergenrath.
The main interchange stations on line 37 are:
to Eupen
to Mönchengladbach, Düsseldorf and Cologne