Not all coal porters have the rotary couplers. So does this tipple rotate one car at a time? Does this require an engine to load one car at a time onto the tipple? On the other hand, if your coalporters have the rotary couplers, then a consist can stay coupled together. Am I thinking right. Guess I have never seen one of these tipples in operation. Sorry for the ignorance.
This isn't Al's tipple but you can get an idea about operations