Which decoder in GP35?

[WP_LOCO]

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

[bapguy]

I would say the 2 function one.  A 2 function decoder turns the head lights on or off. A 4 function decoder has head lights plus a strobe or ditch lights.  Joe

[WP_LOCO]

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