Sleeker, Comfier, a Tiny Bit Faster: Riding Amtrak’s New Acela www.nytimes.com/2025/08/29/t... "Curves, outdated signal systems, track congestion, and bridges and tunnels in need of repair keep Acela from reaching its top speed on all but about 35 of the route’s 457 miles, according to Amtrak."