Thanks for that. Quite enjoyable.
Those things are fun to watch. I noted that the cameraman must like getting blasted with the flying snow since it happened more than once..
Did you know that the power unit (the modified F7B - with the diesel prime mover and generator but no traction motors) is called a ‘snail’? The function of the ‘snail’ power unit is to generate the power to run the big fan. The entire assembly must be pushed by a ‘real’ locomotive. This is as opposed to the more common ‘slug’ which is a ballasted unit with traction motors on the drive axles but no prime mover. It gets its power from the Mother and can move itself - as long as it is connected to the mother unit.
Also when SP did the original conversion, the four traction motors from the F7B were installed in the rotary body and coupled to a tandem gear box to drive the fan. The 207 (one of the units in that video) was rebuilt in 2014 and the four traction motors driving the fan from the F7B were replaced with two traction motors from an SD50 and the 1500hp 16 cylinder EMD567 (the original F7 prime mover) was replaced by a 12 cylinder EMD635 of (I think - source of the info was not clear) 1750 hp..
All the trivia you didn’t ask for.. ;-)