This article is from the Model Trains FAQ, by Christopher D Coleman with numerous contributions by others.
You can follow the grading standards in GRADING STANDARDS AND OTHER
JARGON and look up a price in a guide, but that is only an
approximation. In order to find a price you will also need to know
catalog numbers from the items, presence or absence of boxes and set
boxes, date of manufacture (if known) and color and truck variations.
Look at the MEETS section for details on this.
 
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