Commuters were told to expect delays up to an hour after a train was towed at South Brisbane Station on Friday morning.

TransLink warned that people travelling outbound on the Cleveland line could endure 60-minute delays from 9am on Friday.

A Queensland Rail spokeswoman said the train had suffered a "rollingstock fault" and was towed to the main yard for testing.

She said it was not yet clear what caused the fault or if it was engine-related.