Snowdrift at Bleath Gill...
Everyone in the film looks old beyond their years.
Given that it was only ten years after the end of WW2, many of those featured will have been in the armed forces or served on the railways during those years.
Coupled with the fact that food rationing didn't finally end until July 1954 and the country was still pretty much worn out, it's not surprising that time took its toll on people.
The line closed in 1962 but left its mark on the landscape.
This is the section of the track in the video.
This
Street View link shows the track as it is today viewed from the bridge at the RHS of the above screen shot.
There's an interesting, if somewhat long, blog post about the area here:
Bleath Gill: Whatever Happened to the Heroes?
Incidentally, the rescued locomotive is preserved in operational order at the Great Central Railway.