John B. Recently posted a track plan to the ModelRailwayEngineer community asking for wiring suggestions.
The plan for his OO gauge layout is below. John wanted suggestions on where to connect a single DC controller.
The consensus from the community of where to connect power feeds was between the points at the bottom of the track, as below.

John’s proposed OO gauge track plan with member suggestions of where to connect the power.
Connecting the feed at the point marked in Blue will allow power to flow around the layout.
More of a debate occurred on if, and where, isolating fish plates should be used.
Some suggested on the oval marked Red, others suggested between the points, using isolated joiners on the inner oval to prevent accidental shorts was another suggestion.
How would you wire this? Would you use isolating fish plates and if so where. Add your thoughts in a comment below.
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Andy is a lifelong modeler, writer, and founder of modelrailwayengineer.com. He has been building model railways, dioramas, and miniatures for over 20 years. His passion for model making and railways began when he was a child, building his first layout at the age of seven.
Andy’s particular passion is making scenery and structures in 4mm scale, which he sells commercially. He is particularly interested in modelling the railways of South West England during the late Victorian/early Edwardian era, although he also enjoys making sci-fi and fantasy figures and dioramas. His website has won several awards, and he is a member of MERG (Model Railway Electronics Group) and the 009 Society.
When not making models, Andy lives in Surrey with his wife and teenage son. Other interests include history, science fiction, photography, and programming. Read more about Andy.