Alternative form of it's not the whistle that pulls the train

Alternative form of it's not the whistle that pulls the train

Boasting and loud talk should not be mistaken for the work that produces real achievements; bravado is no proof of action.

(UK, historical) A defence notice; an official request to news editors not to publish or broadcast items on specified subjects for reasons of national security (replaced in 1993 with the DA-notice).

(UK) A defence advisory notice, an official (but unenforceable) request to news editors not to publish or broadcast items on specified subjects for reasons of national security.

(music, voice) A note extremely high in the register, but not falsetto.

(colloquial) hardly, not at all

(idiomatic) To have no common sense; to be ignorant of the most basic facts; to be very confused.

(humorous, euphemistic) Lacking in intelligence; dimwitted.

plural of not the sharpest knife in the drawer