When you use the grey nickel EZ Track, do you need feeder wire if the track gets too
large at dead spots.  Would you solder the feeders on like any other track?

I was on some other model RR sites and they directed me here since I got a starter set for my kids
last Xmas.  As we set it up this year, my older son and i went to a train show and bought another
tank engine (0-4-0) and a car to go along with it.  This is additional to our Bachmann set.  Bare with me as I am new to all of these terms as this hobby is growing me and in some cases more than my son, lol!

My questions are about these EZ track.  When I was a kid my dad had a set, but it wasn't EZ track.  It was those traditional tracks (possible the code 83) with the copper or metal (not sure) couplers, a terminal set of track you wired yourself to the power pack.  Believe it or not, my dad gave me the older power pack with which works.  This means I have two power packs, 1 from my new Bachmann set and one from my dad.  I plan on running both power packs (if possible) with two engines running on two different lines.  My question is, can I get those connectors that come with the Bachmann power pack and wire it to my old power pack.  It's like a mix and match kind of thing.  My goal is to have two or three engines on two lines with cut offs wherever necessary.  I've done some research and think it can be done, but my main question is about the old power pack I have.  

Thanks in advance and bare with me as i'm very new to this and I think all of you can educate me.