Artificial intelligent assistant

vestibuled

ˈvestibuled, a. orig. U.S.
  [f. vestibule n.]
  Of a train: Provided with vestibules.

1890 T. M. Cooley, etc. Railways Amer. 249 The first of the vestibuled trains went into service on the Pennsylvania Railroad in June, 1886. 1898 Westm. Gaz. 26 Apr. 6/4 The vestibuled corridor dining-car trains on the East and West Coast routes to Scotland.

Oxford English Dictionary

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