I was curious about the load on a z1000 with 3 lionchief + locos. Here is a screen shot of meters on three tracks running a Gp-20 freight with 8 cars, a sd-60 with 9 cars, and a FT ABA with two powered units, 3 boxcars, and 6 lighted passenger cars (not LEDS). All are powered by a single z 1000.
Assuming these are watts (probably not precise, but close?) this is near to the limit for a z-1000. Didn't I read on the forum that 5 amps is about what the circuit breaker handles? this is about 4.5.