Definition of "ill luck"

Then, as we have reported, bogie defects came to light on the first few production "Deltics" [...]; these have now been remedied, but inevitably deliveries, trial running and particularly crew training were retarded as a result, so that once again ill luck has dogged the East Coast Route timetable planners.

1961 September, “Background to the new winter timetables of the East Coast”, in Modern Railways, page 528