Ii have a set of E7's AA from WBB, both are powered units. I would like to upgrade them to tmcc Using ERR components. What would I need to control both units?
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Probably what Lionel does with its two unit diesels - two independent ERR systems, perhaps one with sound. Two with sound is better but more costly......
Are you planning to go into the stump pulling business on the side Dave?
I want to pull 12 21" cars so the extra power will help but if all else fails I could go into the stump pulling business Lol.
You'll need two of the Commander series units, either the DC Commander or the Cruise Commander. You can add the RailSounds Commander to either one of them or both. My preference is the Cruise Commander for the obvious benefit of the cruise control.
You'll end up with two independent locomotives that will run singly or in an MU configuration if desired.
Personally, I like the sound in both units, it really has a very neat effect with both units with engine sounds. 
