Lindsay3 is a railcar, railmotor, doodlebug, or what ever you call it in your area of the world.
Designed to fit on a HO scale MRC F7 chassis, items like couplers, end plates/pilots and detail items need to be added by the builder.
Lindsay3 is an adaptation of
Lindsay2, please see Lindsay2 for more photos and details.
Like Lindsay2 the model is optimized for printing in WSF (now know as Natural Versatile Plastic), and was designed for strength which increases the cost over that of similar sized models.