Which dd40ax's have two motors?

[traineer]

Which dd40ax's have two motors? I don't want to buy one and find out it only has one motor, I have heard the spectrum versions have two, but i was wondering if any others do?

[jbsmith]

 a simple search found these,,just several of them here

http://metrohobbies.goods.officelive.com/BacHONDD40AX.aspx

http://www.amazon.com/Bachmann-Trains-Pacific-Dd40Ax-Centennial/dp/B001CXT0D2

http://www.trains.com/mrr/default.aspx?c=a&id=3352

[RBMN #425 Fan]

I'm pretty sure that the ho scale ones are double motor, and the n scale ones single