Some major delays for train commuters this morning.
Services weren't running on the Grange, Outer Harbour and Gawler lines from Mawson Lakes.
That's thanks to scheduled weekend work taking longer than expected.
Substitute buses are in place until further notice.
The Transport Department says services are slowly resuming after passengers were left waiting from 7am - the original operating time.
Construction took place over the weekend as part of the Torrens Rail Junction Works.