I was looking at my Lionel 38415 Legacy PRR U28c to see what is necessary to remove the shell to service the smoke unit. The fan motor is noisy and I wanted to try to lubricate the motor to see if I could quiet it down.
Originally I thought that this was a three piece shell but it is only a two piece shell. The cab in the front of the engine is held in place by two small screws with two tiny washers inside the shell between the frame and the cab itself. The rest of the shell is one piece with the rear held in place by two more screws and washers between the frame and the shell. The center part of the shell is held in place by plastic tabs in several areas on both sides that are simply pushed into place in the frame.
There is a seam between the center portion of the shell and the cab. You need make sure to put the shell back on so that there is a tight fit between the center portion of the shell and the front cab. If not light will shine through the seam when the cab light is on it. So you need to take care to re-seat the center portion of the shell in order to avoid this problem. I may need to put a piece of electrical tape inside the shell to prevent the light from coming through the seam since I have not been able to get the center portion of the shell to seat properly.
Why Lionel designed it this way is beyond comprehension.