Melbourne's Metro Tunnel will open in December this year, Victorian Premier Jacinta Allan has revealed.

The project has been plagued by delays and cost blowouts since it was announced in 2015.

The government announced earlier this week that all five Metro Tunnel stations were now complete, after construction finished on the Town Hall and State Library stations in the CBD. Loading Twitter content

In a post on social media platform X, Ms Allan said the tunnel would open later this year.

"EXCLUSIVE: Metro Tunnel is opening in early December," Ms Allan said.

In June, the government was forced to deny reports the tunnel would not be fully operational when it opened.

It was reported that some train services would run through the nine-kilometre twin tunnels this year but peak-hour servi

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