Anyone have details on this nuclear cask?

One more try on this, is there a web site anyone is aware of that might describe this cask car and what it does. The obvious guess is it contains fuel rods?

It's a Department of Defense car from the few hits I get on the Google.

Looks like it's for moving spent submarine reactors from the shipyard to Idaho.  Navy reactors are not refueled like commercial power plant reactors.

http://www.rrpicturearchives.n...ture.aspx?id=1455094

Thanks guys  for the insights, my original google searches took me to places like this wikipedia link, too generic.  That is a great shot on rr pictures! 

Thanks to MartyE and Steims, I changed the search terms and  this is the best information I found this morning.  It is a powerpoint presentation with a ton of details on these shipments- the video above obviously shows one of these traveling empty.  Some examples from that presentation

This is obviously a full one being transported.

I did find this interesting one- apparently the next generation into the future

@hokie71 posted:

Thanks guys  for the insights, my original google searches took me to places like this wikipedia link, too generic.  That is a great shot on rr pictures!

I did find this interesting one- apparently the next generation into the future

Hmmm, MTH made a very similar flatcar and that load looks rather easy to replicate.

EDIT: Another hmmm, an old style high-amperage cartridge fuse would make a very good base for the load. The two on the extreme right but without the blades: