crewless

From crew +‎ -less.

crewless (not comparable)

1. 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

• uncrewed