It took me two years, but I have captured the Vermonter going south and north on this bridge. This may soon be a thing of the past, as Amtrak and MA are moving to restore the CT River line.
Interestingly, the northbound shot is only really possible in summer due to the longer days, and the south is only possible in winter due to the mid-day time.
See this shot in Winter and See this shot in the fall