Thank you for your efforts, had this posted on MRH.com and a fellow there solved the mystery. Very clever way of doing things before Decoders and such.
https://www.youtube.com/watch?v=ER8c-zX8cHkr
Have a Great Week all.
RJ

Thanks richg for the lesson in photos. Does not derail the car. I put a few sections of track on both ends and ran a car by it. Just slowed the car down, the wheel moves the two knobs, but the knobs do not turn the wheel.
RJ

I think it is a decelerator for a hump yard! Has no leads coming from it and says Bachmann Hong Kong on the Back. Who better to identify this than a Bachmann fan. 

Thank You fellows, was my guess just wanted to make sure.
RJ

First post on this forum!
Trying to ask a question about a part of HO track I found and want to include a 45KB picture.
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Thank You
RJ

Thanks Joe
Got my DCC track working and loaded the 4 function in the loco and it seems to run okay, better speed settings.
RJ

Have a DCC equipped HO-GP35 #743, my decoder pro is asking for either
a ez command 2 function  (36-552) or
    ez command 4 function (36-550) decoder Other than on track How can I determine which is in the unit?
Thanks RJ