I know not a loop but, finishing the missing link of quading between Penrith and St.Marys on the Main West not mentioned?
would not only help freight, but keep intercity services on time instead of getting stuck behind all station services.
passing siding at Penrith station for freight going west .. but any other upgrade is not going to happen .. two rail bridges will need to be replaced or upgraded which will shut down the line for a long period of time ...
also the changes for rail yards has not happened - new yards and station at emu plains ..
Am willing to stand corrected but the DOWN Loop on the UP side of Penrith Station is approximately 800.0m long (+/-) between catchpoints, what are you proposing to stow there?
If anything Down freight usually wants to get a clear run up the mountain, much like an UP freight wants a clear run at Kingswood Bank.
As for Emu Plains - Hasn't the land set aside for the proposed stabling facility recently gone under a "scomo memorial carpark"?