Amtrak and Canton-based Dunkin’ Donuts is expected to announce on Wednesday that they would offer Dunkin’ coffee on board Amtrak Acela Express high-speed trains throughout the Northeast Corridor.

With the new agreement, Dunkin’ Donuts’ signature hot coffee will now available to the 3.4 million customers who ride Acela Express trains each year. Dunkin’ said its coffee will be served all day in First Class and Café Acela, and will be brewed using the same equipment featured in Dunkin’ Donuts…