This is an On18 "Catecritter" Switcher Kit designed to employ the Kato 11-109 N scale drive mechanism(Not Included). It is 3d resin printed and will require surface prep and finishing as part of the assembly. Includes some 3d printed link pin socket couplers, .020" plexiglass for the windows and. 020" wire for grab irons. Does not include the drive mechanism.