Chassis and Body to convert a Bachmann N scale MDT Plymouth switcher model 60091, 60051, 60090, 60050, into an HOn30 scale Narrow Gauge Critter. "Advanced" version includes more details, and is available in Frosted Extreme Detail and Frosted Ultra Detail ONLY. "Beginner" version features the same basic dimensions, with the omission of small details, and is available in White Strong and Flexible plastic ONLY.