American Interfustrations
I seem to be having the same problem...
As you can observe, I have set up everything correctly and it gives me the message that it will be unloading in one minute. A minute passes, and it claims that the unloading process has started. Truth be told, it does absolutely nothing for the next eternity.
Meanwhile on the 50% broken-in-T:ANE actual American Intermodal route, everything works fine. I have also noticed that, compared to the post SP2-made installation, that I am not able to click on the Mi-jack crane and actually "operate" it.
I have essentially mirrored the entire setup on to one of my own post SP2 routes, but still with no luck.
This has led me to the conclusion that all sessions made after the SP2 update with intermodal transloads simply do not work due to some change in the coding of Trainz.
Dan, the most likely reason why your's still works is because it was made prior to SP2.
Of course, this could still me be making some noob-ish mistake. If so, please help me. This has been driving me nuts for the past day or two!