Well, the old bridges may still be intact but that absolutely does not mean they can support constant 79 - 100 mph Commuter Rail service, especially after sitting unused and left to rot away for such a long time, but that wasn't what I was referring to, this 8500 foot long trestle will run over what was once regular on-grade track, apparently its to minimize the disturbance to the ground and allow animals to pass under the swamp, but it comes at an extra cost of $50 Million.
https://www.nae.usace.army.mil/Portals/ ... leMemo.pdf
https://www.nae.usace.army.mil/Portals/ ... leMemo.pdf
Photo by Alan Thomas: NYNH&H I-4 Pacific #1372 proudly thunders through Forest Hills as it makes its way to Providence R.I.