"Bullet train" at Atlanta intermodal yard

[Scum Mudd]

I am a salesman and I visit a client reguarly near Powder Springs, GA.  Next to the Norfolk Southern yard and close to the adjacent US highway,  there is a shed with what looks like the front end of an Acela or "bullet train" sticking out.  It seems to have a test track in front of it that looks like it dead ends maybe a half mile away.  Does anyone know what this is and why it is there?