With the new technology the Downeaster can proceed all the way to TBS.
Weeeell, the Downeaster might just have a problem at the Trout Brook Bridge!
Trout Brook bridge is a good point, which I didn't think of. I said Sheepscot because some of the curves at Cockeye Curve and on the Mountain Extension would pose an equal challenge, I suspect.
Still...pretty amazing technology!!
It is amazing technology. At first blush, my immediate thought was I would trust this about as far as I do(n't) for self-driving cars. But in the context of Swiss railway engineering and application, this does look brilliant.