Help Me Disassemble an MTH Premier Reefer (Boxcar)

Its usually the door track screws and one in each corner. Once you remove the door track screws, slide the door tracks out through the sides of the shell. It should then come apart.

Justin - thanks. See what you are saying - took those screws out and nothing moved but will re-do in the morning. Thanks. 

After you remove the screws, the lower door tracks have to be slid out from the tabs and completely removed.  As pictured, the tabs are in th sway of the floor coming out of the body.  The fit between the tab on the track and the slot on the body is usually pretty tight.  I take a small flat screwdriver blade and start to slowly pry the track out - work slowly from one end and gently work it loose.  Sometimes the paint has stuck them together and this bond has to "pop".  I've never broken one, but it's easy to see how they can break.