This topic has been addressed many times in earlier posts, but the website by David Harrison which contained the solution is no longer available. Accordingly, I would greatly appreciate any explanation of where to make the necessary cuts/modifications to isolate two oval tracks connected by a #6 ez-track crossover and wired for dc.  Dcc is not an option as the intended users are young boys not yet responsible enough for more expensive equipment.

I know there is some reference to 4 cuts to copper connecting strips; however, I was hoping for more guidance and clarification as to what additional steps are required.

Thank you in advance for your time and courtesies.