Hitler Style Personnel Rail Transport? Rolling through Tuscola IL

I counted 10 of them sandwiched in with car transport rail cars.  Almost sneaky, makes them blend right in with the car transports.  I caught them coming from the South and going East bound though Tuscola IL, where they are headed I could not say.  Maybe they are gonna go North to Chicago or East to Indianapolis, really hard to say.

  Does anyone know why they have a weather proof gasket between them?  If they aren't for prison transport I'm open to explanations.  Also, why does our country need these cars and who ordered them?