Vermont with its median south of Manchester is just as ideal for trench construction as it is for elevated viaduct which would undoubtedly have a lower lifespan. A trench would also allow for simple and cheap at grade station buildings that woukdnt require the exorbitant costs associated with fully elevated or fully underground facilities. I've long said that trenched alignments are underutilized and have a multitude of benefits with assumed cost savings being top of list. Alignment north of Manchester could be cut and cover.
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