Port Morris Docking Facility

The New Haven Railroad had a series of established transfer aprons to receive carfloats at the Oak Point. I have come across a few photographs of these, but they are not very common. I have never come across photographs of the New York Central’s facility at Port Morris, except for one. I believe that I have found what appears to be the docking facility with a strange gantry type crane. How did this system work and how did it take into account the tidal levels of the East River? Was the Port Morris Yard just a place where freight was transferred from barges to rail cars, with no true carfloat facility? Also did NYC third rail electric power run to the water’s edge?

Here is a plan of the facility as it appeared in the 1920’s

Here's a map I have from 1914...

Thanks Otto - This rail map is very intersting and confirms some of the items posted above.