videos in AudioSet
A list of about a million ten-second YouTube clips, each labelled with the sounds in it, that Google published in 2017. Labs use it to train and test general audio and music models.
Including Sweet Line Railroad Winter Motorcar Run, The Wreck of the Norwegian Freighter MV Makefjell Nov. 26 1962., Chicago Trains Foamite Series Chicago & Owasso Trainfest