Folks,
Any of you ever encountered a problem before where seemingly out of nowhere, smoke effects for a certain loco - almost always just the cylinder cocks, whistle, safety valves, but not the exhaust - go almost jet black? It happened to me with the S160 as I was puffing along, and no matter what I do, it won't go away. I couldn't fix it in the scenario, so I restarted the scenario a thousand times to try and sort it. That didn't work, so I restarted TS and tried it again. That didn't work, so I deleted the loco and tender from the scenario, put new ones in, and still had the problem. I restarted TS again, and still had the problem.
I've found others have had this on other "advanced" locos, including from the JT range as well as VW, but it has somehow magically gone away.
What on earth?