I am selling a 'New in the Box'  AMS (Div. of Accucraft) Southern Pacific RR Gondola.  I would say it may be close to G scale.  Box says 1:20.3 / 45mm gauge.  Detailed undercarriage, and metal wheels.  May be compatible with G scale cars/locos and track.  Stickers on the box indicate the MSRP was 145 and it sold for 89.99!!