A bomb exploded on the Multan-Karachi main railway line at 12:30 pm on Saturday, damaging 10-feet long track. However, there was no casualty, Multan Railway SSP Ahmed Mukhtar said. He said that a bomb of high intensity exploded on the up line near 608km mark between Channi-Goth and Sadiqabad. Trains were diverted on the Down track, he added.