Emergency services dealing with an incident on the line at Coatbridge saw some services in and out of Milngavie suspended today.
Builders working on a property in Coatbridge found a grenade, and a number of houses were evacuated and the line closed.
The line was re-opened shortly after 3.15pm on Friday, but Scotrail says there could still be significant delays because of the backlog, with services expected to be back to normal by rush-hour.
The Edinburgh to Milngavie and Airdrie to Milngavie services were either cancelled or delayed because of the incident.
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