Metro commuters faced frustration on Thursday morning as trains were not running to their usual timetable due to "low rail adhesion".
It's a common problem every year on the Metro network - and other railways across the UK - which is otherwise known as "leaves on the line".
"We are running a frequent service with trains running to all destinations but not to the usual timetable. This is due to low rail adhesion," Tyne Wear Metro tweeted on Thursday morning.
