You will need the pickups for sure. The other thing is 2 rail engines come with K-D couplers, not the big "lobster claw" ones 3 railers are used to. I'm told that certain K-Ds can work, but do not have any experience with that aspect. The other option is to create a conversion car that is always behind the engine. One coupler is a K-D, the other is the usual one. Personally, I'd try to get a set of normal electro couplers.
Chris
LVHR