A herd of cows caused disruption on the Edinburgh to Glasgow main line during the Monday morning rush hour.
The 12 animals found their way to the railway line near Lenzie around 8am.
Network Rail said a response team was working to remove the cows “as quickly as possible”.
ScotRail has apologised for any delays caused by the incident as a power outage hit trains across the Central Belt during Monday’s busy journey.
Network Rail said its teams were working to resolve the issue affecting services in Glasgow and Motherwell.
The situation comes as ScotRail services are operating on a significantly reduced timetable due to an ongoing dispute with drivers.
More than a quarter of normal services are being cancelled as the train operator seeks to provide a “reliable” service in the face of crew shortages.
ScotRail said overtime was still required to ensure a normal timetable of more than 2,250 services per day.
However, fewer drivers than usual are working overtime or taking days off as part of the ongoing pay dispute.
Under the temporary measures, only around 1,600 services will operate from Monday to Saturday, with customers warned to expect a change in some first or last trains and the number of services provided during the morning and evening peak hours.
Train drivers are currently voting on a possible strike.
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