Wiring a two train layout with a KW transformer

When you are all set and done with the KW ,I will bet you will not get a full 18 volts to both tracks with trains on each one. I have a mint one and will show a full 20 volts with no load. Put on 8 lionel heavy weights with four 1445 bulbs in each car and a command lionel steamer all it will give me on the one track is 16.5 volts. The current draw at speed via my fluke meter in series is 6.5 amps. The KW should supply 8 amps ideal but doesn;t.
A ZW on the same track will give 18 volts max and that is rated at 275 watts and 20 volts.
If the mfgs are going to keep putting in high current automotive lamps in passenger cars, the transformers are going to have to keep getting bigger.
If you use a kw with some modern low current engines and no lighting in the cars, yes you can run two trains but not at command voltage.
I recently sold a 9 car passenger MTH UP passenger train to a friend and he is using a lionel 180 watt lionel brick. He can only run 6 cars plus engine in command without tripping the circuit breaker.
I sold him one of my spare Z's and he has no trouble with getting 18 volts and all 9 cars and engine in command.
I am not trying to say the KW is bad, it just is not worth 100 bucks if you are going to run passenger trains.
Get something with power, a Z or a MTH Z4000 but not a KW.
Dave.