Soumagne tunnel
| Tunnel de Soumagne | ||||
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 West portal of the tunnel at Vaux-sous-Chèvremont
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| use | Railway tunnel | |||
| traffic connection | HSL 3 | |||
| place | Soumagne | |||
| length | 6505 m | |||
| Number of tubes | 1 | |||
| cross-section | 69 m² | |||
| Largest coverage | 127 m | |||
| construction | ||||
| Client | NMBS / SNCB | |||
| building-costs | € 144,000,000 | |||
| start of building | 2001 | |||
| completion | 2005 | |||
| business | ||||
| operator | Infrabel | |||
| release | 2009 | |||
| location | ||||
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| Coordinates | ||||
| 50 ° 36 '12 " N , 5 ° 38' 14" E | ||||
| 50 ° 36 '39 " N , 5 ° 43' 33" E | ||||
Map with all coordinates: 
The Soumagne Tunnel ( tunnel de Soumagne ) is the longest railway tunnel in Belgium . The structure erected in connection with the HSL 3 high-speed line overcomes a height difference of 120 m. After four years of construction, the trains have been running at speeds of up to 200 km / h since 2009. The west portal is in Vaux-sous-Chèvremont in the Weser valley , the east portal in Ayeneux on the Herver Land at an altitude of 210 m. The tunnel passes under the municipal areas of Chaudfontaine , Fléron , Olne and Soumagne . The slope is between 1.7% and 2%.