With the testing of the new Orange Line cars between Wellington and Sullivan, and at some point Community College, I would consider to be better than out Springfield way. It is more realistic in terms of grades, Dana Bridge and the B&M flyover, then hitting the marks on station platforms and a decent flat between Assembly and Sullivan. Also after dark clearance tests in the tunnels, or how many light bulbs can I plink test! A flat test track at a vendor's test facility could mask some issues or I can do 90 on the flat, can't do crap on a hill.
The Red Line test track I am not sure on the realism in terms of grades but in either case an MBTA test track means MBTA engineers and operators are present and the operators are more aware of the how a train should really run instead of a textbook way.
FULL DISCLOSURE: I played an electrical test engineer who worked up from the field, so I would always laugh at textbook tests that would make things look good even though it had no bearing on how things would be used in the field.
Member of IEEE, BSRA, ERA, BERA, SPH&TS, SFRH&MS, RGM&HS, UPHS, NHRHTA, NE PRRT&HS and PRRT&HS
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