Hostile Territory (2022) on Netflix

In post-civil war America, when a Union soldier is presumed dead, his children are mistakenly sent away on the orphan train. This is a wild-west story of people uniting for the greater good, and children forced to grow up quickly.

Former P.O.W. Jack Calgrove moves Heaven and Earth to be reunited with his children following the Civil War. After returning home, Jack finds out his wife has died and his children, presumed orphans, are heading deep into the West aboard a train crossing old enemy lines. Calgrove and another former soldier are joined by a troop of Native American sharpshooters and a freed slave, as they race to intercept the orphan train before all hope is lost.