I believe I did upthread. Savings included smaller GL fleet (given faster ops on surface lines elsewhere--potentially no new yard cost either) lower operating costs and higher fare compliance. Nice mix of lower costs for vehicles ($100m) yard & shops ($100m)and stations ($300m). With CM/GC doubling all non-vehicle costs, saving $500m in normal costs was worth about $900m in ripoff costs
And it was also proven well upthread that the extensions can't operate past Union or Washington without a Reservoir-sized local yard and maint facility, based on how all other lines are sourced to sustain their headways. Lechmere Yard is going away and the E has been short a home yard since Arborway closed 31 years ago, so sustaining + expanding at the demand the Medford extension puts on the system makes that spec the going rate. And having an equipment base means having enough equipment to supply the base without shorting every other service by yanking too many cars away from them. They ID'd that as 24 cars--pretty consistent with what the power pool run out of Reservoir is--as the going rate.
Arguments to the contrary need to dig into specific inefficiencies that will cost less to fix than turning the service plan on its head. Well...2 decades of studies and detailed traffic modeling are on the books about those requirements. So how'd we make it all the way to 2016 before someone had the temerity to point out the obvious: "Oh, you're doing it totally wrong. A little of this, a sprinkle of that...bang, book it, done! Millions saved!". And it netting a total and instantaneous game-changer of a eureka moment. Did nobody think to ever try that before? Or is it just that hard to come up with additional system efficiencies that make gains big enough to enable wholesale feature cuts to GLX without the costs of paying for those efficiency gains outslugging the savings from pet cuts on GLX? Maybe it just isn't that easy or one-dimensional to find a surplus on the ledger by changing the design.
You have to quantify what magic tricks of streamlining and equipment assignment sleight-of-hand is going to cover that gap to the point where these going-rate builds become optional. The carhouse and vehicle requirements didn't magically appear as late-addition luxury addons to the project. They've been specced in real math since the first detailed scoping studies for West Medford in the late-90's. So have the ridership projections that peg these stops at several times the daily boardings of the very busiest non- fare-controlled stops on the system. Real math has to be counterpointed with some sort of testable math. Something a lot more than a "Well, short this and 'run faster' because reasons and mumbo-jumbo
[*voice trails off*]. Bada-bing!...$900 million saved!" If you are making the assumption that system-wide ops improvements can lower the cost thresholds, then quantify what the system-wide ops improvements will cost. None of them are free candy. Not even POP when it comes to squaring the service goals with the size of the projected station riderships. And any efficiency improvements impinged by the Green Line's atrocious state-of-repair start running up systemic costs larger than the savings from singular pet cuts on GLX. All manner of "run faster, run more nimble" through the Central Subway is intrinsically linked to that SGR bill.
No. That's no better than taking a worst-case upper bound of $63M per station and assuming that a half-billion or more dollars can magically come off the books by zeroing out more than the stations' total worth. All while refusing to explain what one's own view of 'tolerable minimum' ADA-equipped station should cost as a baseline within the physical properties of site access, and while refusing to make any attempt at incorporating the sunk cost for going back and changing the station designs to this mythical tolerable minimum after final design has already been frozen.
This reason why this thread has jumped into a ditch is because of this pervasive belief that no accounting is ever required when the
fucking rightness of one's own personal beliefs and pet cuts is presented as self-evident and infallible.
Fucking rightness is not self-evident if someone can't or won't explain how to deliver on the service goals of the project within the cuts they're presenting.