Definition of "unsung"

Only when one has seen a Control Office at first-hand does one realise the vast amount of unsparing but largely unsung work that is behind the eventual publication, perhaps, of a paragraph in this journal's "Motive Power Miscellany" recording the appearance, within hours of the complete blockage of a main line, of many of its trains, passenger and freight, on routes quite foreign to them; and of effective emergency services either side of the disaster area.

1962 August, G. Freeman Allen, “Traffic control on the Great Northern Line”, in Modern Railways, page 133

He said: "Every day, thousands of unsung women and men go to work to keep London moving and to make this city better, cleaner and safer for everyone. [...]"

2019 November 23, “Network News”, in Rail, page 23