Amandla!

https://www.youtube.com/watch?v=ACEQO6f2O6c

Songs about trains

http://harpers.org/blog/2014/06/the-twenty-three-best-train-songs-ever-written-maybe/
https://en.wikipedia.org/wiki/List_of_train_songs

Britten and Auden: Night Mail

https://www.youtube.com/watch?v=TGc7-SbHJs0
https://silverbirchpress.wordpress.com/2013/07/16/the-night-mail-poem-by-w-h-auden/
http://www.gradesaver.com/w-h-auden-poems/study-guide/summary-night-mail

Steve Reich: Different Trains

https://www.youtube.com/watch?v=1E4Bjt_zVJc
http://musicavaleri.free.fr/html/fichiers_hda/guerre.html