Commuters on the Glen Waverley line are dancing massive delays, as a truck has smashed into a rail bridge.

Buses are now replacing trains between Glen Waverley and Darling but may take an hour to arrive before taking passengers.

A bridge engineer is now looking and assessing the structural integrity of the bridge.

Passengers are being advised to listen to announcements at stations and seek alternative routes where possible.

Gold 104.3 Melbourne