Trains through Glasgow Queen Street Low Level were cancelled on Saturday afternoon following the discovery of a man's body on the line.
Eyewitnesses reported that the Low Level station in the city centre was closed at around noon.
Police cordoned off the area around Dundas Street where an overbridge crosses the railway as an investigation was carried out.
A spokesman for British Transport Police said: "Shortly after 12.10pm today we received reports of a body near to the line at Glasgow Queen Street station.
"Officers and emergency services attended the scene and recovered the body of a man in his early to mid-20s.
"The death is being treated as unexplained.
"Officers are working to identify the man and discover how he came to be on the line."
A Scotrail spokesman, who had earlier said that services were at a standstill, confirmed that both lines through the low level station were reopened at 1.54pm.