You guys are clueless.
That is the new top-secret Chelmsford Anti-Missile Mobile Defense radar tracking unit.
It is coupled to a "normal" AMTRAK engine, and the Prius Hybrid prime mover only powers the on-board electronics via a specialized socket arrangement, but can be called on to assist tractive effort if needs be with it's super-secret 14.5:1 gear ratios and flywheels.
Switches are provided for the operator to redirect power.
Small battery packs are used in "dark" territory, or in case of momentary power failure, to keep the radar tracking.
It is shown with the top cover off while the ground forces contemplate how to upgrade the current handling capabilities of the socket, and to lock several axles (which axles is classified) to improve tracking, as the unit tended to "hunt" at speed.
The roll-up door in the side is the new non-proprietary access for the secret socket assembly.
Next the crews will address the handrails by the doors, which seem to have some impact on full opening of said doors.