Well I have no idea of how many model locomotives I have in my train room and storage space. The same applies to the rolling stock I've collected over the years. Some items are 50 years old and are no longer manufactured, others I build myself, and would not part with. Some items are mint or close to mint condition. If asked, I would say I'm a model railroader, but am I a collector also. So my question is this What is a collector? and what are the criteria for this part of the hobby?