Yankee was a derivitive of the Indain work ankee or theif…
Dandy was a derogitive name for a wanna-be aristocrat…
http://en.wikipedia.org/wiki/Dandies
" The B&M train streamline train Yankee Clipper was one of the fastest trains in New England capable of doing 110 and runs the route of the Amtrak train “Downeaster” Portland-Boston