So, the present depth is 32ft. Let's assume future proofing to 50ft. Again, assume another 15 ft as a buffer. Add another 35ishft to reach the lower deck of a 55ish ft TBM shaft. About 2500ft of tunnel each side and then some trenches either side?
The power ROW could be used to connect 495 to Rt...
https://en.m.wikipedia.org/wiki/Guided_bus
For very minimal cost, this would greatly increase speed/capacity, and would allow both BRT and LRT simultaneously
So I guess all the new buildings being built in downtown Wormtown are all being built by delusional people. I'm going to guess that, baring data from you, the funders dumping a billion or more into Worcester may have data that refutes your feelings.
Worcester Line improvements also facilitate "CompassRail" development. Worcester is the fastest growing city in the NE and better transit is needed to continue. The Worcester Line is the 2nd most used line