Interesting.... For years I have ran many "layout" setups, some temporary while changing design, with use of two PW ZWs wired to various blocks. All I have ever done for blocks is isolate the center rail with a fiber/plastic pin designed for that. Or, sometimes, simply left a gap between rails. Even as far back as the 80s on my Houston area layouts, this worked fine for years on a given layout. Never have I blown any bulbs, or experienced any electrical issues crossing isolated pins while traversing blocks. Maybe an occasional change in speed, but nothing detrimental. Interesting...…. to say the least.
Jesse TCA