Well, my last trivia was a bust - so try this one. Have fun - thanks!
ANSWER:
ONE, person who voted got it right.
The first all, completely roller bearing train was on the:
NEW HAVEN.
It was the name train MERCHANTS LIMITED - 12 Pullmans and 2 diners - the train led by 1111 made the 156.8 mile trip from New Haven to Boston (and next day return) in 1931.