Long bus queues occurred in the CBD this morning after trains to North Sydney ... - Sydney Morning Herald

Long bus queues occurred in the CBD this morning after trains to North Sydney were disrupted. Photo: Matthew Huckstepp

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Trains are back up and running on Sydney's North Shore Line, but hour-long delays remain for frustrated travellers.

Earlier today, police set up barriers surrounding Wynyard railway station in the CBD after an overhead wiring problem at Waverton stopped all north-bound trains on the North Shore Line between Wynyard and Chatswood.

Commuters faced long bus queues in the Sydney CBD today after North Shore Line trains were disrupted. Photo: Matthew Huckstepp

Buses replaced trains between those stations, but commuters reported huge queues and delays to catch replacement buses on Clarence Street.

While trains resumed running between Wynyard and North Sydney just after 8.30am, a replacement bus service was still operating between North Sydney and Chatswood until trains resumed after 10.30am.

At 10am, hundreds of people were still queued outside North Sydney railway station to catch replacement bus services.

‘‘It was mental. It looks like it has calmed down a little bit compared to what it was earlier this morning, but there are still lots of people,’’ said a worker in a business near the station.

Commuters vented their frustration on social media, including one woman who tweeted that the queue at North Sydney ran around a corner and then doubled back.

Another commuter said her boss drove to North Sydney station to pick her up.

At 10am, the Transport Management Centre said there were delays of an hour to some city-bound services on the North Shore line. Earlier, city-bound services had been unaffected by the problem.

There also were flow-on delays of up to 30 minutes to trains across the CityRail network, however earlier bus delays on Clarence Street near Wynyard Station had cleared.

At 9.35am, one commuter, Michael Slezak, had been waiting at North Sydney for 35 minutes but said he had barely moved in the line to get on a replacement bus to Chatswood.

"It's pretty nuts. I've never seen anything like it," Mr Slezak said.

Mr Slezak said replacement buses had been arriving, but they had been delayed by peak hour traffic and struggled to move the volumes of commuters displaced from trains.

"They hardly make a dent," he said, estimating he would face another one- to two-hour wait to get to work at Chatswood.

Flow-on delays of 20 minutes were reported in both directions on the Western, Northern, Bankstown, Airport and East Hills Lines, and the Newcastle and Central Coast Line.

Transport Management Centre spokesman Brett Moore said trains resumed between Wynyard and North Sydney just after 8.30am.

"City-bound trains on the North Shore Line are unaffected and continue to operate as normal," he said.

"Shuttle train services are operating from Chatswood to Hornsby and from Chatswood to Epping."

He said passengers could use their train tickets for travel on STA Sydney Buses and Sydney Ferries on Monday morning due to the disruption.

There was no forecast as to when normal train services would resume from North Sydney to Chatswood, Mr Moore said.

A NSW Police spokeswoman said officers were called to set up barriers near Wynyard station as a safety precaution to keep people from spilling on to the road.

- With Jacob Saulwick