When the White House under Pres. Ronald Reagan announced the Peacekeeper Intercontinental Ballistic Missile (ICBM) program in 1986 it was planed that 50 of the 100 new missles will be mounted on trains.
25 trains, each with two missles. Each train would consist of two locomotives, two security cars, two missile launch cars housing the missiles, one launch control car, one fuel car, and one maintenance car.
After the end of the cold war this program was canceled in 1991.
In the Airforce Museum at Dayton, Ohio, the very interesting prototype of the missle launch car is on display since 1994.
The picture at the web
PEACEKEEPER CAR is not very good.
Overall body length of the launch car is 87 feet. Fully loaded, it would weight more than 520,000 pounds.
But you can not see the wheelarrangement of the or the type of the truck.
it looks like 2 trucks with spanbolsters at each end, and 4 wheel trucks (100 ton RB). Correct?
I ask because this truck arrangement and the extreme weight limit the "use" of this car to the mainlines.
BTW: in the 60´s Minuteman-rockets - I think without warheads - were transported by train! At 6 axle flatcars and loaded in a special 3-axle transport roadtrailer.
In one of the Morning Sun books about UP´s equipment is a photo of such a transport.
Later such transports are made by air.