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train: train: [14] A train is etymologically something that is ‘pulled’ along. The word was borrowed from Old French train, a derivative of the verb trahiner ‘drag’. And this in turn went back to Vulgar Latin *tragināre, a derivative of Latin *tragere, a variant of trahere ‘pull’. It was first used in English for ‘delay’, from the notion of being ‘pulled’ back, and ‘part of a garment that trails behind’ dates from the 15th century.

When steam locomotives pulling carriages were introduced in the 1820s, the combined vehicle was called a train of carriages; the simple term train is first recorded in 1835. The use of the verb train for ‘instruct, school’, which dates from the 16th century, evolved from an earlier ‘direct the course of growth of a plant’, which in turn went back to the original notion of ‘pulling’.
=> tractor
cab (n.): 1826, "light, horse-drawn carriage," shortening of cabriolet (1763), from French cabriolet (18c.), diminutive of cabrioler "leap, caper" (16c./17c.), from Italian capriolare "jump in the air," from capriola, properly "the leap of a kid," from Latin capreolus "wild goat, roebuck," from PIE *kap-ro- "he-goat, buck" (cognates: Old Irish gabor, Welsh gafr, Old English hæfr, Old Norse hafr "he-goat"). The carriages had springy suspensions.

Extended to hansoms and other types of carriages, then extended to similar-looking parts of locomotives (1851). Applied especially to public horse carriages, then to automobiles-for-hire (1899) when these began to replace them.
headlight (n.): large lamp and reflector carried in front to illuminate at night, 1861, originally of ships and locomotives, from head (n.) + light (n.). Related: Headlights, which, as slang for "a woman's breasts," is from 1940s.
rolling (adj.): 14c., past participle adjective from roll (v.). Of prairie land from 1819. From mid-15c. as a verbal noun. Rolling pin is recorded from late 15c. Rolling paper for cigarettes, etc., is from 1969. Rolling stock "wheeled vehicles on a railroad" (locomotives, carriages, etc.) is from 1853.
The rollyng stone neuer gatherth mosse. [John Heywood, "A dialogue conteinying the nomber in effect of all the proverbes in the Englishe tongue," 1546]
roundhouse (n.): also round-house, "lock-up, place of detention," 1580s, from Dutch rondhuis "guardhouse." Meaning "circular shed for locomotives with a turntable in the center" is from 1856. Meaning "blow delivered with a wide sweep of the arm" is perhaps extended from "round building for circular machinery."
scrap (v.1): "to make into scrap," 1883 (of old locomotives), from scrap (n.1). Related: Scrapped; scrapping.
slave (n.): late 13c., "person who is the chattel or property of another," from Old French esclave (13c.), from Medieval Latin Sclavus "slave" (source also of Italian schiavo, French esclave, Spanish esclavo), originally "Slav" (see Slav); so used in this secondary sense because of the many Slavs sold into slavery by conquering peoples.
This sense development arose in the consequence of the wars waged by Otto the Great and his successors against the Slavs, a great number of whom they took captive and sold into slavery. [Klein]
Meaning "one who has lost the power of resistance to some habit or vice" is from 1550s. Applied to devices from 1904, especially those which are controlled by others (compare slave jib in sailing, similarly of locomotives, flash bulbs, amplifiers). Slave-driver is attested from 1807; extended sense of "cruel or exacting task-master" is by 1854. Slate state in U.S. history is from 1812. Slave-trade is attested from 1734.

Old English Wealh "Briton" also began to be used in the sense of "serf, slave" c.850; and Sanskrit dasa-, which can mean "slave," apparently is connected to dasyu- "pre-Aryan inhabitant of India." Grose's dictionary (1785) has under Negroe "A black-a-moor; figuratively used for a slave," without regard to race. More common Old English words for slave were þeow (related to þeowian "to serve") and þræl (see thrall). The Slavic words for "slave" (Russian rab, Serbo-Croatian rob, Old Church Slavonic rabu) are from Old Slavic *orbu, from the PIE root *orbh- (also source of orphan), the ground sense of which seems to be "thing that changes allegiance" (in the case of the slave, from himself to his master). The Slavic word is also the source of robot.
speed (n.): Old English sped "success, a successful course; prosperity, riches, wealth; luck; opportunity, advancement," from Proto-Germanic *spodiz (cognates: Old Saxon spod "success," Dutch spoed "haste, speed," Old High German spuot "success," Old Saxon spodian "to cause to succeed," Middle Dutch spoeden, Old High German spuoten "to haste"), from PIE *spo-ti-, from root *spe- (1) "to thrive, prosper" (cognates: Sanskrit sphayate "increases," Latin sperare "to hope," Old Church Slavonic spechu "endeavor," Lithuanian speju "to have leisure").

Meaning "rapidity of movement, quickness, swiftness" emerged in late Old English (at first usually adverbially, in dative plural, as in spedum feran). Meaning "rate of motion or progress" (whether fast or slow) is from c. 1200. Meaning "gear of a machine" is attested from 1866. Meaning "methamphetamine, or a related drug," first attested 1967, from its effect on users.

Speed limit is from 1879 (originally of locomotives); speed-trap is from 1908. Speed bump is 1975; figurative sense is 1990s. Full speed is recorded from late 14c. Speed reading first attested 1965. Speedball "mix of cocaine and morphine or heroin" is recorded from 1909.
stack (n.): c. 1300, "pile, heap, or group of things," from a Scandinavian source akin to Old Norse stakkr "haystack" (cognate with Danish stak, Swedish stack "heap, stack"), from Proto-Germanic *stakon- "a stake," from PIE *stog- (cognates: Old Church Slavonic stogu "heap," Russian stog "haystack," Lithuanian stokas "pillar"), variant of root *steg- (1) "pole, stick" (see stake (n.)). Meaning "set of shelves on which books are set out" is from 1879. Used of the chimneys of factories, locomotives, etc., since 1825. Of computer data from 1960.
train-spotting (n.): 1959 (train spotter attested from 1958), chiefly British English, in reference to the hobby of recording the numbers of railway locomotives one has observed; from train (n.) in the railroad sense + verbal noun from spot (v.).