A tram has derailed after being hit by a cement mixer truck in Melbourne.

The tram derailed along Collins Street after being hit by the truck about 1pm on Wednesday.

No one was injured, police said.

The truck driver, a 25-year-old Tarneit man, stopped and assisted police with their inquiries.

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The intersection of Collins and Exhibition streets have reopened.

Passengers were warned there may be delays along the 11, 12, 48 and 109 tram routes as services resumed.