Police finish 'major operation' at Sydney's Town Hall Station after evacuation prompts commuter havoc

NSW police have concluded a major operation at Sydney's Town Hall Station about 90 minutes after an emergency evacuation order shut down the station, causing havoc for commuters.

Hundreds of people were ushered out of the station and all train and light rail services to and from Town Hall were suspended due to a "commuter disturbance", Sydney Trains confirmed.

Police and other emergency personnel have conducted a major sweep of the area but identified nothing of concern.

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The evacuation order caused mayhem for commuters, with some stranded on trains being held hear Town Hall.

Trains on the North Shore, Northern lines and City Circle line which were suspended during the shut-down have now resumed, but there are still major delays across the network.

"Major flow on delays are affecting the Sydney Trains network. Stopping pattern changes will occur," Sydney Trains said in a tweet.

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Commuters are being urged to continue to avoid or delay non-essential travel through the station where possible.

Other train routes affected by the emergency closure were:

• T2 Inner West and Leppington Line - started and terminated at Central Station;
• T3 Bankstown Line - started and terminated at Central Station;
• T4 Eastern Suburbs & Illawarra Line - started and terminated at Central Station; trains were halted between Central and Bondi Junction;
• T8 Airport & South Line - started and terminated at Central Station;
• Central Coast and Newcastle, Blue Mountains and South Coast Lines were starting and finishing their trips at different stations than usual.