Etymology
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locomotive (adj.)
1610s, "pertaining to movement," from French locomotif, from Latin loco "from a place" (ablative of locus "place;" see locus) + Late Latin motivus "moving" (see motive).

From 1650s as "moving from place to place;" by 1814 as "having the power of moving by itself. The noun meaning "engine which travels on rails by its own power" is from 1829, short for locomotive engine, which is attested from 1814. A locomotive engine used without rails was a traction engine, which became tractor.
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choo-choo (n.)
Child's name for "steam-engine locomotive," 1895, echoic (choo-choo cars is attested from 1891).
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cow-catcher (n.)

"strong frame in front of a locomotive for removing obstructions such as stray cattle," 1838, from cow (n.) + catcher.

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entrain (v.2)
"get on board a locomotive train," 1860s, from en- (1) "in, into" + train (n.). Related: Entrained.
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locomotor (adj.)
1870, "of or pertaining to locomotion;" probably based on locomotion (as motor/motion). Earlier as a noun, "something with locomotive power" (1822). Related: Locomotory; locomotorial.
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wallbanger (n.)
cocktail made from vodka, Galliano, and orange juice, by 1969, in full Harvey wallbanger. Probably so called from its effect on the locomotive skills of the consumer.
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tender (n.1)
"person who tends another," late 15c., probably an agent noun formed from Middle English tenden "attend to" (see tend (v.2)); later extended to locomotive engineers (1825) and barmen (1883). The meaning "small boat used to attend larger ones" first recorded 1670s.
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decapod (n.)

1819, "ten-legged animal, type of crustacean having ten legs" (crabs, lobsters, shrimp), from French décapode (1806), from Modern Latin Decapoda (animalia), from Greek dekapoda, neuter plural of dekapous "ten-footed" (see ten + foot (n.)). From 1885 in reference to a type of locomotive with ten driving-wheels.

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airplane (n.)
1907, air-plane, from air (n.1) + plane (n.1); though the earliest uses are British, the word caught on in American English, where it largely superseded earlier aeroplane (1873 in this sense and still common in British English). Aircraft as "airplane" also is from 1907. Lord Byron, speculating on future travel, used air-vessel (1822); and in 1865 aeromotive (based on locomotive) was used, also air-boat (1870).
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gauge (n.)

early 15c., "fixed standard of measure" (surname Gageman is early 14c.), from Old North French gauge "gauging rod" (see gauge (v.)). Meaning "instrument for measuring" is from 1670s; meaning "distance between rails on a railway" is from 1841.

Railway-gage, the distance between perpendiculars on the insides of the heads of the two rails of a track. Standard gage is 4 feet 8 1/2 inches; anything less than this is narrow gage; anything broader is broad gage. The dimension was fixed for the United States by the wheels of the British locomotive imported from the Stephenson Works in 1829. [Century Dictionary]
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