Learning about turnouts

NY Central #1906 steaming down the mainline I have two #6 turnouts and a double crossover in my first layout. I thought the #6 turnouts we're non-power routing based on my reading. But the first attempt layout proved that wrong. With a power routing turnout, the track in the direction of the turnout's setting is powered, and in the other branch, non-powered. When the turnout is toggled, power is moved to the other branch, and the previously powered branch is now non-powered. I learned this multiple ways. First, I thought my dual loop layout could be powered by a single piece of terminal track powering the entire layout. The layout is small, so I thought that would be good enough. However, the power routing turnouts and crossover break current in the non-powered direction. So, initially only one of my loops worked. Second, the initial layout had a second spur leading off the first. But without a power connection on that spur, it would always be dead. Third, attempting to r...