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The most distinguishing feature of the 5623 and other "torpedo boats" is the cluster of air tanks on the top of the long hood. The top of the short hood is also unusually cluttered with the various steam generator fixtures and the radio antennas.

This is the rear of the long hood, looking backward. The square lid at the extreme end is the rear sand box filler and the valve sticking up on the right side is the vent for the engine cooling system. Note that on early GP9's, there are two 36" cooling fans at the rear and two more behind the cab. The two engine exhaust stacks stick up between the inner tanks.
 

The top of the short hood is covered with parts. On the left, under the "wagon wheel" radio antenna, is the air intake for the steam generator. Ahead of that, is the generator exhaust. To the right of the air intake are the generator safety valve pipes. The cylindrical object in the center is the antenna for the telemetry receiver and the small wire antenna to its right rear is for the secondary radio. Again, the sand box filler occupies the extreme end, right behind the red warning light.
 

On the left is a view of the front sand box lid. It would appear to be right off the EMD part shelf for plain bearing switcher journal box lids. It is embossed, "NATIONAL FLEXO-4 AAR-1947" and is identical to the covers found on the OTR's GP7, #97, pictured to the right.
 

This view is of the radiators under the front fans. These two leaking cores had to be replaced. Behind them, under the tanks, can be seen the tops of the twin air cleaner housings. This view is presented to show the relationship of the fans to the radiators on most early EMD hood units. This little adventure in parts removal is covered in the "Repairs" section.