Trains have started running again across most of the CityRail network, but major delays are expected to continue through afternoon peak hour.

To add to commuters' problems, traffic is banked up getting out of the city towards the inner west, after a cement truck tipped over on Victoria Road, Rozelle.

Rolled at Rozelle ... the accident causing tailbacks on the Anzac Bridge. Credit:Peter Hannam

A spokesman at the NSW Transport Management Centre says the truck is blocking one lane and traffic is backed up on the Anzac Bridge.