Yeah, it's a Spectrum SD45.  I was wondering what Bachmann meant by "dummy" operation using those jumpers.  Thanks.

Just got my first DCC engine the other day.  It runs well, but I was curious if there is a way to disconnect the board and run the engine as straight DC since I haven't upgraded my controller yet.  I'm just looking to protect the electronics until that time.

Thanks.

Gentlemen,

Thank you very much for the great explanations.  

What is the difference/purpose for these types of couplers?  Can they be interchanged? 

Thanks for any insight.