Might be worth noting that just because the trains are being sent for scrap does not mean the materials they were made from can't be recycled.
Missing the point. It would be much more carbon intensive to build brand new trains - no two ways about it.
And nearly everyone I know who wears their 'green' credentials on their sleeve is hiding some kinds of grossly hypocritical behaviour that they are almost always blissfully unaware of.
All these greenies - they're always driving the latest two-tonne Landcruisers - diesel in a metro area usually so they can cause particulate pollution where it'll do the most damage ("But I need it for safety"). They always throw out their phone every year and get a new one (because you have to now-days). They renovate their homes and throw out perfectly good stoves, fridges, dishwashers etc because they want all new ("Ugh, that's soooo nineties"). Can't have a TV more than four years old - need one with all the latest Android, QLED blacks, whatever.
This relentless desire for new (and fully imported) has a cost to the planet in the form of coal that needs to be burnt to make the stuff they they're lusting over - only they don't even think about it because it happens OFF-SHORE and out-of-sight - and often with OUR coal and OUR gas. Most of the stuff they throw away can't be recycled - it goes into landfill for future archeologists to marvel over our throw-away consumption lust.
And yet the same people on this board who engage in that 'new is best' thinking are nearly always the same ones pillorying me for having the cheek to demand cheap and accessible electricity for poor Australians and to create jobs for Australian people - because how dare I want to use our own resources on-shore to make life easier for the poor!
So have your brand new Belt-and-Road Chinese built trains with the exciting new regenerative braking and the whizz-bang LED display boards - it's all borrowed money anyway, who cares, you're not going to be the ones paying for it - some future generation of long-suffering Victorian taxpayers will be the ones paying it back.
Why not start planning to throw the Siemens trains in the bin - they're a relatively small orphan order, a mistake of Kennett allowing National Express to buy what they wanted to buy. There's probably sufficient justification with incompatibility with the rest of the fleet to get rid of them: Chop 'em up and put 'em in the bin I say and get brand new Chinese ones on the Belt-and-Road credit card. And then the X'traps - well they're getting on now and they were built on the cheap anyway - AND they're made of (ugh!) mild steel instead of stainless. In the bin they go!