The Girl Telegrapher's Peril (1915)

Blake, a quarrelsome lineman, and a widower with two daughters, is in love with Helen, but she rejects his advances. Helen spies Myra, Blake's three year old daughter, who has ventured onto the tracks of the oncoming Elwood Express, and just in the nick of time, grasps the girl off the tracks, but in so doing, must leap off a trestle into a river thirty feet below

Unfortunately the movie The Girl Telegrapher's Peril is not yet available on Disney Plus.