I'm not. I'm putting a kybosh to your plan on running the metro to regent's park along the surface corridor without segregation from the existing sydney trains network. The metro crossing a sydney trains line is a huge no go for operational and safety reasons regardless of if it can be technically done. The SSFL was put under the bankstown line at sefton to separate that lines freight from the sydney trains network. In what world wouldn't the current government do exactly the same thing for it's metro which it is selling as segregated to the public of Sydney.
C'mon Sim's, what the hell do you think separates a DD from a freight train, A Give Way sign, time to open your eyes a bit. Of course the technology exists, its there now!
Also note, how many freights a day are really talking about in commuter operational hours?
You have taken the "segregation" term out of context.
The SSFL was sunk because it takes 4min for a 1500m freight train to cross that intersection with a safety buffer either side. There is a DD every 5min, on average so doesn't leave much to play with and hence to be removed from the curfew, grade separation was required.
Alternatively the Metro could run to Sefton under the same concept as proposed before. Might actually be cheaper than Reagents Park.