is there such thing as a dash 9 train?

Answer 1

Indeed, at least regarding locomotives. The Dash 9 designation refers to a locomotive model built by GE, which were introduced in the 1990s (they have since been proceeded by GE's new Evolution Series of cleaner burning locomotives).

Answer 2

There is no such thing as a Dash9 'train' which is the whole shebang - prime mover, freight or passengers cars etc. There is a dash9 locomotives - see the first answer.