At stud his other winners included Blue Peter, Watling Street, Garden Path and Fair Trial.
Kingsway's dam Yenna won minor races in France and England and had some influence as a broodmare, being the female-line ancestor of the 1000 Guineas winner Blue Bunting.
Several major racecourses, including Epsom and Doncaster, were closed for the duration of the conflict, either for safety reasons, or because they were being used by the military.
Many important races were rescheduled to new dates and venues, often at short notice, and all five of the Classics were usually run at Newmarket.
At the end of the year the colt was removed from Smyth's care and transferred to the stable Joe Lawson at Manton, Wiltshire.
[5] On his final appearance of the year, Kingsway produced a much better effort when finishing second, beaten half a length by Nasrullah in the Champion Stakes.
[6] Kingsway remained in training as a four-year-old and won four times, taking three races at Ascot Racecourse and one at Windsor.
[2] In their book A Century of Champions, based on a modified version of the Timeform system, John Randall and Tony Morris rated Kingsway an "inferior" winner of the 2000 Guineas.