Train services to and from Glasgow Central are running as normal after repairs to overhead wires were completed.
Services were cancelled and delayed in the south of Glasgow, to Paisley and Ayrshire and on cross-border routes to London, Liverpool and Manchester on Thursday.
Network Rail said that engineers worked through the night to complete the repair.
An investigation is under way to establish what caused the damage.
The majority of platforms had reopened by late afternoon on Thursday.
Network Rail Scotland posted on social media: “All repairs to the damaged overhead wires at Glasgow Central are complete and a full service will operate this morning.
“Thank you again for your patience yesterday, we’re sorry for the disruption.”