Hello @SkeletonKing69,
Thank you for the information, I still would like to know a time frame particularly of the blocks lifespan, EX
"I placed the block on the train ran away for like 5 minutes, came back within distance of the train for 2 minutes, then it went invisible"
I dont believe LODS are the issue here, there is likely some underlying issue with the network update. Your client isnt getting those block updates even though I send them to everyone within the trains network group, if there are players nearby.
Before releasing this latest update I had tested both on Oxide and Carbon to ensure no blocks get left behind or go invisible. My tests for both server types included building a small train, then letting it drive around the rail network while I watched. During this time I did not observe any blocks being left behind, the test ran for roughly 2 hours before I concluded the build stable.
I'm starting my Oxide server now so we'll see if that still holds true.