It is understood the animal escaped from Wishaw Abattoir Ltd, located close to the railway line.
The official ScotRail twitter account initially shared a post at 7:35pm which read: "There's a pig (yes, you read that right) on the line at Wishaw. Police and @NetworkRailSCOT
are trying to capture it right now, so our Glasgow Central - Lanark services won't be calling at Wishaw for the moment."
A subsequent tweet said that the rail operator has since been informed the animal is a wild boar.
A ScotRail spokesman said they understand the animal has escaped from a nearby abattoir.
The rail operator’s twitter post has already drawn several comments on the social media platform.
Among the comments was one from someone called Jools, who quipped: "Stop telling porkies."