Hi George!
Boy, I've gotta fire up the way way back machine to help you out.
I had the older LL Es and the MT Zscale pops right in the front. I used the Medium or Short Unimate in the rear.
I used them to pull my Con Cor "Phoebe Snow" until I finally replaced them with Kato Es that I custom painted.
The Z in the nose coupled up fine with the Kato knuckles that I put in the Con Cor trucks. They also coupled fine with the
MT N scale couplers on the express Boxcars. The Kato couplers were the older 11-702 that was on the older Kato passenger cars. The MT N coupler trip pin hit the pilot because the pin had to go through the screw hole, and the longer ones drooped.
Wow I didn't know those brain cells were still accessible.
The LLs are long gone, and my more correct version of Phoebe is pulled by Kato or BLI Es.
Greg O.