The crash occurred at high speed about 23:00 (21:00 GMT), said Belgium’s rail infrastructure manager, Infrabel.
“A train… carrying around 40 passengers crashed into the back of a freight train on the same track,” Infrabel added.
“The crash caused a violent shock, the spokesman said, adding there were casualties, but gave no details. He said local emergency services and reinforcements from the nearest city of Liege were at the site of the crash” Spokesman, Frederic Sacre, was quoted as saying by Belga news agency.