Also note the grey commons to the track need to be a larger gauge than reds, because the greys, from transformer to transformer then to the track, each section between transformers, carries the amps of the transformers before it, so at each "stop" the bus should get larger. Between the last and the track drops it should handle ALL amps combined.
The reds only carry amps for one suppy.
(don't short yourself on the common side bus gauging; I see this a lot)
