"Buffalo Bill and the Iron Horse" from Frontier Fighters #7 (DC, 1956) by Dave Wood and Joe Kubert
For 8 issues in the mid-50s, DC published an anthology featuring various real-life frontiersmen like Davy Crockett and (above) Buffalo Bill. Probably because the Buffalo Bill stuff was drawn by Joe Kubert, some of those particular stories were reprinted in the early 70s. But only some, and that's a real shame. Pretty much a forgotten series.