The Union Pacific Railroad produced its classic documentary film Last of the Giants in 1959 as a fitting tribute to the world's largest steam locomotives-the Big Boys. UP cameramen filmed the Big Boys over a three-year period, which Pentrex re-released in 1992. It ran for a total of just 23 minutes, leaving hours of unused footage that was set aside for many years.
Unfortunately the movie Last of the Giants Volume II is not yet available on HBO Max.