Fishermans Bend could get its own sky rail - an elevated freight railway line through the planned environmentally sustainable new suburb to prevent it being overwhelmed by truck traffic to and from Melbourne's port.

The Andrews government released an updated planning blueprint for Fishermans Bend on Monday, a sprawling industrial precinct south-west of the CBD that it wants to transform into a new mega-suburb for 80,000 residents and 60,000 workers.

It wants four in every five trips in the precinct to be made by public transport, cycling or walking, in a major break from car dependency.

But the blueprint made only fleeting reference to one of the key transport links supporting the plan - a proposal to build a major freight rail connection through the heart of the new suburb.