Edwin S. Porter's pioneering 1903 western short about a gang that robs a train and the posse that hunts them down.

Public domain (US): Published 1903; all works published in the US before 1931 (and foreign works published before 1931) are public domain in the US (95-year term expired). Source: Internet Archive (https://archive.org/details/TheGreatTrainRobbery_555).