Wellington commuters travelling by train have been hit by delays this morning.

Metlink is warning commuters to expect delays across the network after a worker accidentally knocked a fire sprinkler.

That caused the Wellington train station to be evacuated just after 7am and brought all services to a halt.

Meanwhile, the 6.47am service from Masterton to Wellington is being held outside Maymorn after a truck hit a bridge.

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And the 6.20am service on the same line had to be held at Waterloo station for approximately 23 minutes because of a medical emergency.

The central train station has reopened.