Piggy Packer.  This is the kit that was offered by N-Scale of Nevada around 1990 or so.  The instructions stated it would take around six hours to build.  It took me closer to eighteen hours!  The kit consisted of a number of sub-assemblies.  In order to not get frustrated, I decided to complete only one sub-assembly a day.  I also fashioned the handrails out of steel guitar wire instead of the brass wire that came with the kit for added durability.  I painted the unit per the instructions, but decided to leave it unmarked, operating as a generic unit.