There are a few tweaks needed to make the fiddle yards user-friendly for the operators at an exhibition.
If your layout is old-fashioned DC controlled, as ours is, then its handy to have some isolating sections to allow you to have two locomotives standing on the same road.
This gives you the option of either running round the train and putting same same loco back on the other end or bringing a fresh engine into the front to take the train for the return journey around the layout.
Himself has also installed the function to have a separate controller for the fiddle yard so someone can be shunting in there while someone else is taking care of the mainline.
Yes, yes, I know you could do all this and more with DCC but you're wasting your breath.