New ACL FT ABA, A & B powered (4 motors), pulling 12 passenger cars, 11 lighted ( dim elongate neon-like bulbs in one car I took apart, others may be regular incandescent); when the train approached a gentle gradient, the breaker on the ZWL lit up and the track went dead. I removed one car at a time until at nine cars, eight lighted, it ran O.K. all around a long double loop, Cars all MTH 18" Premier. Would the Z4000 power up enough (without breaking) to run all 12 passenger cars? Or is there another way to get enough juice to the track without the circuit breaking? ? Best way to measure power draw accurately?