a train of thought

a train of thought

a series of connected thoughts You interrupted my train of thought - Now I can't remember what I was going to say.
See set in train
See also: of, thought, train
References in classic literature ?
So when I saw you throw down your paper and enter upon a train of thought, I was very happy to have the opportunity of reading it off, and eventually of breaking into it, as a proof that I had been in rapport with you.
Then your eyes fixed themselves upon your newly-framed picture of General Gordon, and I saw by the alteration in your face that a train of thought had been started.