One of the mysteries of the English language finally explained.
1Also with capital initials. A train which transports motor cars together with their drivers and passengers; a rail service of this type. [A trademark in the United States.]
2A road vehicle consisting of a series of linked trailers or passenger cars pulled by a lorry or other motor vehicle. Compare "road train". Now rare.
Early 20th century (in an earlier sense). From auto + train.
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