https://levelcrossings.vic.gov.au/__data/assets/pdf_file/0004/387643/Clyde-Road-Technical-Brochure.pdfSomething does not quite make sense here. Among the valid arguments against road under rail at Lilydale are that there would be an impact on underground services, requiring extensive excavations, and that the road would have to be closed during construction. Berwick is of course not Lilydale, but wouldn't the same constraints be applicable?The impression the pictures give me is that the rail line is elevated on both the approaches, suggesting more of a hybrid, but other than that I agree with you questioning their arguments. If the Longford gas line is near there going own is going to impact it one way or another.
The blurb for Berwick says, in part,
"Other designs would take up to a year longer to complete, would require compulsory acquisition of private properties and significant underground service relocation, including the Longford gas main."
"Other designs" means designs other than road under rail. Does not road under rail also imply significant underground service relocation, possibly including the Longford gas main?
It's not a hybrid, according to the technical brochure.
Also shows where the gas main is located in the brochure too.