Danny Harmon's first railfan video shot in 1995 of the Bone Valley operations in Central Florida. Back in this time, he actually was able to do in-cab videos. We get to see the engineer control his train at 0.2-0.3 mph (0.32 - 0.48 kph) through a mine loader.
https://youtu.be/TckHGVzvGeU
https://youtu.be/TckHGVzvGeU