NEW YORK — Even though Train is responsible for the ditty that by some measures was last year’s most popular song — the ubiquitous “Hey, Soul Sister” — the trio has yet to experience that kind of massive mainstream popularity. Although Pat Monahan has fronted the group for over a decade, he’s never been a household name, and people who know the chorus of “Soul Sister” probably wouldn’t be able to name Train’s other two members, guitarist Jimmy Stafford and drummer Scott Underwood.

Monahan acknowledges that kind of anonymous success used to grate on him — but he puts the emphasis on “used to.”