@BReece posted:I am sure the phasing is correct, no blinking lights, train slows and speeds up with no apparent jerking. My problem was connecting the "hot" wire from where?
to each transformer by disconnecting the red (hot) to ←of? each transformer and connecting the black (common) from where?
to each transformer everything is now good.
Thanks very much for the guidance/advice.;
Brent
Not to be mean, but still vague. It sometimes takes some language change for to minds to meet. I'm pretty patient, hopefully you are too. (I had to train 15yr old assistants at that mousey restaurant with games. Many knew NOTHING. You are way ahead of them already 😉
At the units, black to black. Off the units black another black wire. This is a "bus" or drop for everything needing common. This wire should now be bigger. Big enough to handle all amps of both units added together. e.g. 180w + 180w for 2 KW units. Further down this build, we may want to step down a size or two but there is only too small a wire for us. Bigger is safer and won't effect us a bit; no such thing as too big. Buses may lead to a terminal block to allow easy step downs to smaller wire where you want them. You've also shortened the total distance you need to go with fat wires. You can now use the block as a new start point for all AWG measuring.
You can sort of use either term at times, but drops come off a bus. A bus would be larger usually. Get it?
Reds are now to be treated as individuals. Size to handle max output of the unit it comes from (180w and two throttles, don't mean 90w per. One thettle might use say 10w at rhe moment leaving 170w for #2, so both of these red wires must handle the whole 180w.(some transformers actually do have Xwatts per handle. But inside are actually two small transformers. Safer to assume it's one big one if you aren't sure. You can also make a bus out of each of these too (separated individual one for each red of course)).
Choose wire with AWG charts online. Your concerns are distance and amps, ignore volts, you aren't powering anything massive at a plant. More distance causes voltage drop and heat in small wire as it tries to push the amps asked for by loads. (think of water, it's pressure, and how a garden hose dia. size l& length might effect flow. Same kinda concept 
)
