Title: Train of thought
Content:  The train of thought or track of thought refers to the interconnection in the sequence of ideas expressed during a connected discourse or thought, as well as the sequence itself, especially in discussion how this sequence leads from one idea to another. When a reader or listener "loses the train of thought" (i.e., loses the relation between consecutive sentences or phrases, or the relation between non-verbal concepts in an argument or presentation), comprehension is lost of the expressed or unexpressed thought. The term "train of thoughts" was introduced and elaborated as early as in 1651 by Thomas Hobbes in his Leviathan, though with a somewhat different meaning (similar to the meaning used by the British associationists):
Title: My Train of Thought
Content:  "My Train of Thought" is a song written by Bruce Burch and Michael Woody, and recorded by American country music artist Barbara Mandrell. It was released in February 1989 as the second single from the album I'll Be Your Jukebox Tonight. The song became Mandrell's final Top 40 single, reaching number 19 on the Billboard Hot Country Singles & Tracks chart.
Title: Thought
Content:  and "thinking" can also be used to refer not to the mental processes themselves but to mental states or systems of ideas brought about by these processes. In this sense, they are often synonymous with the term "belief" and its cognates and may refer to the mental states which either belong to an individual or are common among a certain group of people. Discussions of thought in the academic literature often leave it implicit which sense of the term they have in mind. The word thought comes from Old English þoht, or geþoht, from the stem of þencan "to conceive of in the mind, consider".
Title: Train of Thought (Community Arts Tour)
Content:  Train of Thought is an evolving community arts journey from west to east coast, with on-board activities and over 20 stops along the way. Train of Thought is produced by Toronto's Jumblies Theatre with partners all across Canada and will be taking place May and June 2015.
Title: Train of Thought (A-ha song)
Content:  "Train of Thought" is a song by Norwegian band A-ha, released on 24 March 1986 as the fourth single from their debut studio album, Hunting High and Low (1985). The lyrics for this song were based on the existentialist authors and poets Gunvor Hofmo, Knut Hamsun and Fyodor Dostoevsky – Pål's favourites at the time. It was A-ha's third consecutive top-10 single in the UK, reaching number eight. It was not a pop hit in the United States, but a 12-inch single featuring a remix of the song appeared on the Hot Dance Club Play charts. The single sold 500,000 copies worldwide. Another remix by Steve Thompson was released in 1986.
Title: Train of Thought (Community Arts Tour)
Content:  Train of Thought is an evolving community arts journey from west to east coast, with on-board activities and over stops along the way. At each stop, a travelling company will get off until the next train comes through. Local arts organizations will host interactive events, and add to creative tasks. Additional travellers will hop aboard to join in conversations and art-making en route.
Title: Pure thought
Content:  Pure thought is an English translation of an expression originally attributed to Kant and Hegel. Their usage of the German counterpart revolved around the question of whether pure thought could exist without an object or some material. Today, more popular uses exist. The usage here is that pure thought is simply a process, another term for thought experiment.
Title: Thought experiment
Content:  those of their prior, imaginary experiment. The English term thought experiment was coined (as a calque) from Mach's Gedankenexperiment, and it first appeared in the 1897 English translation of one of Mach's papers. Prior to its emergence, the activity of posing hypothetical questions that employed subjunctive reasoning had existed for a very long time (for both scientists and philosophers). However, people had no way of categorizing it or speaking about it. This helps to explain the extremely wide and diverse range of the application of the term "thought experiment" once it had been introduced into English. The common goal of a thought experiment is to explore the potential consequences of the principle in question: ""A 
Title: The Lost Train of Thought
Content:  When about to tell Jenifer about his punishment, Simly, Becker's favorite Briefer calls Becker in for a Mission. He along with the Octogenarian, Shahzad Hassan and Jelani Blaque are called in as a second team to find a missing train of Thought that was supposed to supply The World with enough Thought for the next six weeks. When Thought was first discovered, it was debated on how it should be used. Some felt the Raw Thought should be given directly to the people of the World while others felt it should be processed first. It was decided for Raw Thought to be given to people in The 
Title: Train of Thought (Cher song)
Content:  "Train Of Thought" is the second single released by an American singer/actress Cher from her 1974 album Dark Lady. It reached number #27 on the Billboard Hot 100 and #9 on the Adult Contemporary chart. Allmusic retrospectively described this song as "raw and fast-moving rock." In 1976, the song was covered by an American singer-songwriter and musician Gene Pitney.

Question: where does the phrase train of thought come from?
Answer: Thomas Hobbes in his Leviathan.