The 2004 PMT estimated $35.5M with the 2 NH stations, North Chelmsford, and no UMass.
That comes out to about $55M in 2023 dollars after factoring inflation...then add UMass. UMass may need up-and-over access considerations (or at least a graft-on to the existing ped overpass) and possibly an elevator for the up-and-over...let's say that one takes $10M. So figure $65M. If all platforms follow the MBTA design guide they'll be full 800-footers; the T doesn't do shorties unless physically constrained. But the NRPC estimate from '04 would've factored that, so we're good.
Probably no rolling stock needed for the following reasons:
- The T is sitting on a surplus of coaches with the bi-level fleet at full strength and a number of single-levels sitting mothballed. That's accelerating as more each new bi provides 1.5x the seating of a displaced flat. To the degree they need any more bodies, they can simply slow the rate at which the displaced flats are retired.
- The cab car count is generously increasing with this ongoing Rotem order, meaning the total number of trains run can increase and more than swallow the increases needed for both this and South Coast Rail.
- A few decade out-of-service GP40MC locos are being returned to service, padding out an existing surplus of locomotives.
- The layover-less Lowell Line has the highest number of 'waste' miles on the system from positioning deadheads. Having a proper layover is enough to convert a couple dead runs into properly-spaced revenue runs, negating the need to come up with whole-cloth new equipment for lengthening the schedules.
Throw in $10M for "contingencies" and other hidden sources of bloat and we're at about $75M, which feels kinda right for a project like this.