Older train models

[Tom17]

I have "The Centennial" DD40X LOCO  41-666-01 Up with Dielsel Horn  HO scale
How can I find out what it's worth

[ACY]

Check ebay, brand new in mint condition with the original box it is worth about $40, used it is worth about $30.

[glennk28]

keep in mind that even new in the box, these trains generally are older technology--compared to current production.  gj

[jward]

considering the fact that a good running, well detailed model of this locomotive has been recently released by bachmann, i doubt it would be worth anything. comparing the older dda40x with the new is like comparing a yugo to a mercedes......