Amtrak's Superliner bedroom. Paul Morigi/Getty Images for Amtrak Amtrak is adding private rooms to overnight Northeast Regional trains between Washington, DC and Boston this spring. Three types of rooms are offered including a roomette, bedroom, and accessible bedroom. The longest journey is nine hours and 58 minutes from Washington to Boston. Visit the Business section of Insider for more stories. The overnight trains between Washington, DC, and Boston are getting slightly more bearable with upgrades coming this spring.