There are delays on the Metro this morning.
There is a gap in service of up to 20 minutes to trains between South Hylton and Pelaw due to a train being withdrawn.
And there are delays across the network due to low rail adhestion.
It comes a day after a series of problems caused major disruption to the network.
Services were suspended yesterday morning after a train failed between Heworth and Pelaw.
The disruption occurred around 8am and lasted for an hour, with replacement bus services running.
Then a second breakdown around 1.30pm meant delays of up to 35 minutes to services between St James and Chicester on the South Tyneside line.
And a signalling malfunction at Pelaw later in the afternoon cuased hold-ups across the network.