Like the other responses... It's not transition era, but I have a small collection of shipping photographs for MH-53 helicopters.
Most are shipped by truck, but we did ship 3 by train. Two were loaded on 53' flat-bed semi trailers, and added to trailer-trains. The third was trucked north, to Alabama, before being trans-loaded onto a flat car.
When I find these photos, I'll post the applicable ones here. (It's a collection I'm desperately trying to find; in the disorganized, cluttered sea of mid-remodeling boxes. The collection also contains some of the only photos of a helo we chopped up with hydraulic shears and concrete saws, in 2006 (a crash recovery). ...War is hell.)