[4] The passenger train comprised two SNCB Class AM96 electric multiple units.

The passenger train was travelling at about 90 kilometres per hour (56 mph) when it ran into the rear of the freight train,[7] which was either stationary,[5] or travelling at 10 to 15 kilometres per hour (6 to 9 mph).

[3] It was reported that an earlier lightning strike had caused disruption on the Liège–Namur railway line.

[7] Belgian Prime Minister Charles Michel tweeted his condolences to the victims and wished the injured a speedy recovery.

[3] Following the accident, it was revealed that the signal that was passed at danger was not equipped with the TBL 1+ train protection system, which is capable of automatic brake application if a train passes a red signal.

It was intended that all track repairs would be completed by the evening of 9 June,[12] which was achieved.