crewless
English
    
    
Adjective
    
crewless (not comparable)
- Without a crew; unmanned
- 1961 February, “Talking of Trains: Automated trains in New York”, in Trains Illustrated, page 78:- The short but extremely busy subway shuttle service on the northerly track between New York's Times Square and Grand Central Station will soon be provided by crewless three car trains.
 
- 1964 November, “Automatic helper locomotive control on the Louisville & Nashville RR, USA”, in Modern Railways, page 354:- A device for the automatic control of crewless helper locomotives cut into the make-up of heavy freight trains has been perfected by the Louisville & Nashville RR in conjunction with the General Railway Signalling Co.
 
- 2013 December 26, Dave Rudd, “No hands on deck: Dawn of the crewless ship”, in The Financial Times:- No hands on deck: Dawn of the crewless ship
 
 
Synonyms
    
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