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Good posts - not much new to say. I've read that stranded wire theroetically offers slightly lower resistance compared with the same gauge of solid, but frankly the difference is irrelevant for model railroad applications. Use stranded wherever the wire needs to be flexible. Also consider using it for any connections that may be undone periodically for maintenance, etc. I use solid for the interiors of my control panels because its easier to thread into the solder contacts. I also use it for feeders from the track. But I use 18-gauge stranded for the bus wires so I don't have to worry about breaks if I need to push some of it around a bit for access.
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