TRAIN OF THOUGHT

A train of thought is a connected series of thoughts. This use of the word “train” apparently predates its use with railways [1].

 The song “Train of Thought” by Norwegian rock trio A-ha was a UK Top 10 hit in 1985 [2].

 e.g. “For the last three days, the only thing to interrupt my train of thought was a particularly noisy monkey.”

[1] Cresswell, Julia. “train” In The Oxford Dictionary of Word Origins. Oxford University Press, 2009.
[2] “A-Ha” In Encyclopedia of Popular Music, edited by Larkin, Colin. Oxford University Press, 2006. 

Photo credit: Charlie Jackson