I have a DCC command controller and a walk around currently. Can I connect another DCC command controller to the track so my son can control his trains separately from mine? I have 6 train and he has 5. I know the walk around will only work the trains that are programed in to the command controller. I want to be able to control my engines at the same time as he is doing his on another part of the layout with a different controller. Any help would be appreciated. Thank you.     

I am looking for a wiring diagram for putting a Bachmann 44913 into a Bachmann EMD GP40 Diesel. Can anyone help me? Thank you.