An improvised bomb exploded early Saturday on the eastern Cairo-Zagazig railway track causing damage without leaving any casualties, Al-Ahram arabic news website reported.
The explosion brought train movement betwen Cairo and Zagazig to a halt.
It is not known who planted the bomb, according to the head of Sharqiya security directorate Hassan Seif.
Seif said that the bomb resulted in 50 centimetre length of fractures, and a hole of 35 centimetres.
Explosives experts have been combing the area to ensure there are no other devices planted.
Stoppages in railway services due to bombs have been common since the ouster of Islamist president Mohamed Morsi in July 2013.