Mike,
This time I think I'm finally starting to get a hang of everything you've been trying to tell me. I took the earlier photograph of the tanks on the train and cropped it down to just the rear deck of the last vehicle. I can see the five engine (forward) and five transmission (rear) covers quite clearly. All rotating on the same single hinge.
Just so that I'm clear in my mind, the engine covers and the transmission covers can't be opened for maintenance at the same time, and for each individual engine cover to be opened the turret must be made to rotate a few degrees. If I'm right, what a pain in the butt this vehicle must have been.
Cheers,
Dan