Wheel set

[darthraven]

I have a Pacific flyer set.  I want to replace the plastic wheels with metal, I have gone through every paper it came with and while I can find the stock number to replace them with new plastic ones (2967) I can not find the size I need to get for the metal ones there are 2 different choices for wheels in HO scale.  36" and 33"  I have no idea which one I should purchase, I have tried using google to find the answer but it just directed me to vendors of this train.  Any help would be appreciated.  Please keep in mind I am new before bashing me if this is a stupid request.

This is the set. http://www.bachmanntrains.com/home-usa/products.php?act=viewProd&productId=3091

[cwmeeks]

In my limited experience, typically Freight cars (reefers, box cars) are 33" and Passenger (Pullman) cars are 36"

c

[darthraven]

Thank you.  That helps significantly.