please dont take offence mr bachmann but i need help with dz 125 decoders in spectrum locos ..     any ways i have 2 sd 45 locos and 2 dash 8-40 locos i am thinking of putting digitrax dz 125 decoders in them but im new to dcc and confused.  after installing the decoder what can u do with the lights..    and how do u speed match the locos so u can run them in a consist all help would be appreciated   thank you and happy railroading

I have a old spectrum diesel 8 c dash 40 with body mounted couplers I'm using easy snap track what turning radius does it need to be